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Common ethanol fuel mixtures

(Redirected fromNeat alcohol fuel)

Severalcommon ethanol fuel mixtures are in use around the world. The use of purehydrous or anhydrousethanol ininternal combustion engines (ICEs) is only possible if the engines are designed or modified for that purpose, and used only inautomobiles,light-duty trucks and motorcycles. Anhydrous ethanol can be blended withgasoline (petrol) for use in gasoline engines, but with high ethanol content only after engine modifications to meter increased fuel volume since pure ethanol contains only 2/3 of theBTUs of an equivalent volume of pure gasoline. High percentage ethanol mixtures are used in some racing engine applications as the very high octane rating of ethanol is compatible with very high compression ratios.

Summary of the main ethanol blends used around the world in 2013

Ethanol fuel mixtures have "E" numbers which describe the percentage ofethanol fuel in the mixture by volume, for example, E85 is 85%anhydrous ethanol and 15% gasoline. Low-ethanol blends are typically from E5 to E25, although internationally the most common use of the term refers to the E10 blend.

Blends of E10 or less are used in more than 20 countries around the world, led by the United States, where ethanol represented 10% of the U.S. gasoline fuel supply in 2011.[1] Blends from E20 to E25 have been used in Brazil since the late 1970s. E85 is commonly used in the U.S. and Europe forflexible-fuel vehicles.Hydrous ethanol or E100 is used in Brazilianneat ethanol vehicles and flex-fuel light vehicles and hydrous E15 called hE15 for modern petrol cars in the Netherlands.[2]

E10 or less

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E10, afuel mixture of 10%anhydrous ethanol and 90% gasoline sometimes calledgasohol, can be used in theinternal combustion engines of most modernautomobiles andlight-duty vehicles without need for any modification on the engine or fuel system. E10 blends are typically rated as being 2 to 3 octane numbers higher than regular gasoline and are approved for use in all new U.S. automobiles, and mandated in some areas for emissions and other reasons.[3]

 
Typical warning placed in the fuel filler of U.S. vehicles regarding the capability of using up to E10 and warning against the use of blends between E20 and E85.

Other common blends include E5 and E7. These concentrations are generally safe for recent engines that should run on pure gasoline. As of 2006, mandates for blendingbioethanol into vehicle fuels had been enacted in at least 36 states/provinces and 17 countries at the national level, with most mandates requiring a blend of 10 to 15% ethanol with gasoline.[4]

One measure of alternative fuels in the U.S. is the "gasoline-equivalent gallon" (GEG). In 2002, the U.S. used as motor fuel, ethanol equal to 137,000 terajoules (3.8×1010 kWh), the energy equivalent of 1.13 billion US gallons (4.3 gigalitres) of gasoline. This was less than 1% of the total fuel used that year.[5]

E10 and other blends of ethanol are considered to be useful in decreasing U.S. dependence on foreign oil, and can reducecarbon monoxide (CO) emissions by 20 to 30% under the right conditions.[6] Although E10 does decrease emissions of CO and greenhouse gases such asCO2 by an estimated 2% over regular gasoline, it can cause increases in evaporative emissions and some pollutants depending on factors such as the age of the vehicle and weather conditions.[7] According to the Philippine Department of Energy, the use of up to 10% ethanol-gasoline mixture is not harmful to cars' fuel systems.[8] Generally, automobile gasoline containing alcohol (ethanol or methanol) is not recommended to be used in aircraft.[9]

Availability

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E10 Logo required onDelaware fuel dispensers
  • E10 became the standard fuel at petrol stations in the United Kingdom as of September 2021.[10]
  • E10 was introduced nationwide in Thailand in 2007, and replaced 91 octane pure gasoline in that country in 2013.[11]
  • E10 is commonly available in theMidwestern United States. It was also mandated for use in all standard automobile fuel in the state of Florida by the end of 2010.[12] Due to the phasing out ofMTBE as a gasoline additive and mainly due to the mandates established in theEnergy Policy Act of 2005 and theEnergy Independence and Security Act of 2007, ethanol blends have increased throughout the United States, and by 2009, the ethanol market share in the U.S. gasoline supply reached almost 8% by volume.[13][14]
  • Mandatory blending of ethanol was approved in Mozambique, but the percentage in the blend has not been specified.[15]
  • South Africa approved a biofuel strategy in 2007, and mandated an 8% blend of ethanol by 2013.[15]
  • A 2007 Uruguayan law mandates a minimum of 5% of ethanol blended with gasoline starting in January 2015.[16] The monopolic, state-owned fuel producerANCAP started blending premium gasoline with 10% of bioethanol in December 2009, which will be available in all the country by early January 2010.[17]
  • The Dominican Republic has a mandate for blending 15% of ethanol by 2015.[4]
  • Chile is considering the introduction of E5, and Panama, Bolivia and Venezuela of E10.[18]
  • India achieved the target of 10 percent ethanol blending, 5 months ahead of schedule, in June 2022.[19]
  • From January 2018, all 92-octane fuel in Vietnam is mandated to contain 5 percent ethanol (E5). No ethanol blending is required for 95-octane fuel.[20]
  • From June 2021, Argentina approved an E12 minimum (Law 27640), and after October 2022 a waiver for a maximum of E15.[21][22]
Low ethanol blends used around the world (E5 to E25)
CountryEthanol
blend
Legal useCountryEthanol
blend
Legal useCountryEthanol
blend
Legal useStateEthanol
blend
StateEthanol
blend
Countries with mandatory blends or available for optional use  European Union  United States
(states where mandatory only)[n 1]
  Argentina[21]
E12
Mandated[n 2]  Mexico[18]
E6
Mandated[n 3]  Austria[27]
E10
Optional  Florida
E10
  Minnesota
E10
  Australia[28]
E10
Optional  New Zealand[29]
E10
Optional  Denmark[27]
E5
Optional  Hawaii
E10
  Missouri
E10
  Brazil[30]
E18-E27.5
Mandated  Pakistan[31]
E10
Optional  Finland[32]
E5/E10
Mandated  Iowa
E10
  Montana
E10
  Canada[33]
E5
Mandated[n 4]  Paraguay[34]
E18/24
Mandated  France[35][36]
E5/E10
Optional  Kansas
E10
  Oregon
  China[38]
E10
Nine provinces  Peru[39]
E8
Mandated[n 6]  Germany[41]
E5/E10
Optional[n 7]  Louisiana
E10
  Washington
E10
  Colombia[42]
E10
Mandated[n 8]  Philippines[44]
E10
Mandated  Ireland[45]
E4
Mandated  California[46]
E10
  Costa Rica[47][48]
E7
Mandated[n 9]  Thailand[51]
E10/E20
Mandated  Netherlands
E5/E10/hE15
Optional
  India[52]
E20
Mandated  Vietnam
E5
Optional  Romania[53]
E4
Mandated
  Jamaica[54]
E10
Mandated[n 10]  Zimbabwe[55]
E20
Mandated  Sweden[56]
E5/E10
Mandated
  Malawi[15]
E10
Mandated[n 11]
See the country notes at the end of the article

A 2011 study conducted byVTT Technical Research Centre of Finland found practically no difference in fuel consumption in normal driving conditions between commercial gasoline grades 95E10 and 98E5 sold in Finland, despite the public perception that fuel consumption is significantly higher with 95E10. VTT performed the comparison test under controlled laboratory conditions and their measurements showed that over a distance of 100 kilometres (62 mi), the cars tested used an average of 10.30 litres (2.27 imp gal; 2.72 US gal) of 95E10, as opposed to 10.23 litres (2.25 imp gal; 2.70 US gal) of 98E5. The difference was 0.07 in favor of 98E5 on average, meaning that using 95E10 gasoline, which has a higher ethanol content, increases consumption by 0.7%. When the measurements are normalized, the difference becomes 1.0%, a result that is highly consistent with an estimation ofcalorific values based on approximate fuel composition, which came out at 1.1% in favour of E5.[57]

Sweden

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Reduction mandate of greenhouse emissions from fossil fuels in Sweden by means of biofuel mixtures[58][59]
YearGasolineDieselJet kerosene
20204,2 %21 %-
20216,0 % (1 Aug)26 % (1 Aug)0,8 % (1 July)
20227,8 %30,5 %1,7 %
202310,1 %
7,8 %**
35 %
30,5 %**
2,6 %
202412,5 %
6%*
40 %
6%*
3,5 %
202515,5 %
6%*
45 %
6%*
4,5 %
202619 %
6%*
50 %
6%*
7,2 %
202722 %*54 %*10,8 %
202824 %*58 %*15,3 %
202926 %*62 %*20,7 %
203028 %*66 %*27,0 %
*) The reduction was reduced to the EU minimum level (6 percent for petrol and diesel) according to a bill by theKristersson Cabinet in 2023.[60]
**)Further reduction was paused during 2023 based on a bill by theAndersson Cabinet.

In Sweden, all 95-octane gasoline is E10 (6 to 10 percent of ethanol) since 1 August 2021, when the proportion of ethanol was increased from E5. In the early-mid-1990s, some fuel chains also sold E10. All newer and many older petrol cars bought in Sweden should handle this,[61] since from January 2011, the Fuel Quality Directive (Directive 2009/30/EC) applied through its transposition into the law of Sweden as a member of the 27 member states of the EU.[62]

E15

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Typical manufacturer's statement in the car owner's manual regarding the vehicle's capability of using up toE10.

E15 contains 15% ethanol and 85% gasoline. This is generally the highest ratio of ethanol to gasoline that is possible to use in vehicles recommended by some auto manufacturers to run on E10 in the US.[63][64] This is due to ethanol's hydrophilia and solvent power.

As a result of theEnergy Independence and Security Act of 2007, which mandates an increase in renewable fuels for the transport sector, theU.S. Department of Energy began assessments for the feasibility of using intermediate ethanol blends in the existing vehicle fleet as a way to allow higher consumption of ethanol fuel.[65] TheNational Renewable Energy Laboratory (NREL) conducted tests to evaluate the potential impacts of intermediate ethanol blends on legacy vehicles and other engines.[65][66] In a preliminary report released in October 2008, the NREL presented the results of the first evaluations of the effects of E10, E15 and E20 gasoline blends on tailpipe and evaporative emissions, catalyst and engine durability, vehicle driveability, engine operability, and vehicle and engine materials.[65][66] This preliminary report found none of the vehicles displayed a malfunction indicator light as a result of the ethanol blend used; no fuel filter plugging symptoms were observed; no cold start problems were observed at 24 °C (75 °F) and 10 °C (50 °F) laboratory conditions; and as expected, computer technology available in newer model vehicles adapts to the higher octane causing lower emissions with greater horsepower and in some cases greater fuel economy.[65]

Other sources make the opposite claim about fuel economy. According toConsumer Reports, "ethanol isn’t as energy-dense as regular gasoline so you will see worse fuel economy with E15 gas.”[67]

In March 2009, a lobbying group from the ethanol industry, Growth Energy, formally requested theU.S. Environmental Protection Agency (EPA) to allow the ethanol content in gasoline to be increased from 10% to 15%. Organizations doing such studies included the Energy Department, the State of Minnesota, theRenewable Fuels Association, theRochester Institute of Technology, the Minnesota Center for Automotive Research, andStockholm University in Sweden.[68]

 
EPA's E15 label required to be displayed in all E15 fuel dispensers in the U.S.

In October 2010, the EPA granted a waiver to allow up to 15% of ethanol blended with gasoline to be sold only for cars and light pickup trucks with a model year of 2007 or later, representing about 15% of vehicles on U.S. roads.[69][70][71] In January 2011, the waiver was expanded to authorize use of E15 to include model year 2001 through 2006 passenger vehicles. The EPA also decided not to grant any waiver for E15 use in any motorcycles, heavy-duty vehicles, or nonroad engines because current testing data do not support such a waiver. According to the Renewable Fuels Association, the E15 waivers now cover 62% of vehicles on the road in the US, and the ethanol group estimates if all 2001 and newer cars and pickups were to use E15, the theoretical blend wall for ethanol use would be approximately 17.5 billion gallons (66.2 billion liters) per year. The EPA was still studying if older cars can withstand a 15% ethanol blend.[72][73]

The EPA waiver authorizes sale of E15 only from Sep 15 to May 31 out of a black hose and a yellow hose to flex fuel vehicles only from June 1 to Sep 14. Retailers have shunned building infrastructure due to the costly regulatory requirements which have created a practical barrier to the commercialization of the higher blend. Most fuel stations do not have enough pumps to offer the new blend, few existing pumps are certified to dispense E15, and no dedicated tanks are readily available to store E15. Also, some state and federal regulations would have to change before E15 can be legally sold.[69][70] The National Association of Convenience Stores, which represents most gasoline retailers, considers the potential for actual E15 demand is small, "because the auto industry is not embracing the fuel and is not adjusting their warranties or recommendations for the fuel type." One possible solution to the infrastructure barriers is the introduction of blender pumps that allow consumers to turn a dial to select the level of ethanol, which would also allow owners offlexible-fuel cars to buy E85 fuel.[73]

In June 2011 EPA, in cooperation with theFederal Trade Commission, issued its final ruling regarding the E15 warning label required to be displayed in all E15 fuel dispensers in the U.S. to inform consumers about what vehicles can, and what vehicles and equipment cannot, use the E15 blend. Both theAlliance of Automobile Manufacturers and theNational Petrochemical and Refiners Association complained that relying solely on this warning label is not enough to protect consumers from misfueling.[74][75] In July 2012, a fueling station inLawrence, Kansas became the first in the U.S. to sell the E15 blend. The fuel is sold through a blender pump that allows customers to choose between E10, E15, E30 or E85, with the latter blends sold only toflexible-fuel vehicles.[76] As of June 2013[update], there are about 24 fueling stations selling E15 out of 180,000 stations across the U.S.[77]

 
Blender fuel pump inEast Lansing, Michigan selling E15 together with the standard gasoline (E10), and the higher blends E30 and E85.

In December 2010, several groups, including the Alliance of Automobile Manufacturers, theAmerican Petroleum Institute, theAssociation of International Automobile Manufacturers, the National Marine Manufacturers Association, the Outdoor Power Equipment Institute, and theGrocery Manufacturers Association, filed suit against the EPA in theUnited States Court of Appeals for the District of Columbia Circuit. The plaintiffs argued the EPA does not have the authority to issue a “partial waiver” that covers some cars and not others. Among other arguments, the groups argued that the higher ethanol blend is not only a problem for cars, but also for fuel pumps and underground tanks not designed for the E15 mixture. It was also argued that the rise in ethanol has contributed to the big jump in corn prices in recent years.[78][79] In August 2012, the federal appeals court rejected the suit against the EPA. The case was thrown out on a technical reason, as the court ruled the groups did not have legal standing to challenge EPA's decision to issue the waiver for E15.[79][80] In June 2013 theU.S. Supreme Court declined to hear an appeal from industry groups opposed to the EPA ruling about E15, and let the 2012 federal appeals court ruling stand.[77]

 
2012Toyota Camry Hybrid fuel filler cap showing warning regarding the maximum ethanol blend allowed by the carmaker, up to E10 gasoline. The warning label indicates that ethanol blends between E15 and E85 shall not be used in this vehicle.

As of November 2012[update], sales of E15 are not authorized in California, and according to theCalifornia Air Resources Board (CARB), the blend is still awaiting approval, and in a public statement the agency said that "it would take several years to complete the vehicle testing and rule development necessary to introduce a new transportation fuel into California's market."[81]

According to a survey conducted by theAmerican Automobile Association (AAA) in 2012, only about 12 million out of the more than 240 million light-duty vehicles on the U.S. roads in 2012 are approved by manufacturers are fully compliant with E15 gasoline. According with the association,BMW,Chrysler,Nissan,Toyota, andVolkswagen warned that their warranties will not cover E15-related damage.[82] Despite the controversy, in order to adjust to EPA regulations, 2012 and 2013model year vehicles manufactured byGeneral Motors can use fuel containing up to 15 percent ethanol, as indicated in the vehicle owners' manuals. However, the carmaker warned that for model year 2011 or earlier vehicles, they "strongly recommend that GM customers refer to their owners manuals for the proper fuel designation for their vehicles."Ford Motor Company also is manufacturing all of its 2013 vehicles E15 compatible, includinghybrid electrics and vehicles withEcoboost engines.[83] AlsoPorsches built since 2001 are approved by its manufacturer to use E15.[82] Volkswagen announced that for the 2014 model year, its entire lineup will be E15 capable.[84]Fiat Chrysler Automobiles announced in August 2015 that all 2016 model yearChrysler/Fiat,Jeep,Dodge andRam vehicles will be E15 compatible.[85]

In November 2013, the Environmental Protection Agency opened for public comment its proposal to reduce the amount of ethanol required in the U.S. gasoline supply as mandated by theEnergy Independence and Security Act of 2007. The agency cited problems with increasing the blend of ethanol above 10%. This limit, known as the "blend wall," refers to the practical difficulty in incorporating increasing amounts of ethanol into the transportation fuel supply at volumes exceeding those achieved by the sale of nearly all gasoline as E10.[86][87]

hE15

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Example of public gas station with hE15 next to diesel and regular gasoline in the Netherlands.

A 15% hydrous ethanol and 85% gasoline blend, hE15, has been introduced at public gas stations in the Netherlands since 2008. Ethanol fuel specifications worldwide traditionally dictate use of anhydrous ethanol (less than 1% water) for gasoline blending. This results in additional costs, energy usage and environmental impacts associated with the extra processing step required to dehydrate the hydrous ethanol produced via distillation (3.5-4.9 vol.% water) to meet the current anhydrous ethanol specifications. A patented discovery reveals hydrous ethanol can be effectively used in most ethanol/gasoline blending applications.[88][89]

According to the BrazilianAgência Nacional do Petróleo (ANP) specification, hydrous ethanol contains up to 4.9 vol.% water. In hE15, this would be up to 0.74 vol.% water in the overall mixture. Japanese and German scientific evidence revealed the water is an inhibitor for corrosion by ethanol.[90]

The experiments show that water in fuel ethanol inhibits dry corrosion. At 10,000 ppm water in the E50 experiments by JARI and 3,500 ppm water in the E20 experiments by TU Darmstadt the alcoholate/alkoxide corrosion stopped. In the fuel ethanol this resembles 20,000 ppm or 2 volume% in the case of JARI and 5 x 3500 = 17,500 ppm of 1.75 volume% in the case of TU Darmstadt. The observations are in line with the fact that hydrous ethanol is known for being less corrosive than anhydrous ethanol. The reaction mechanism will be the same at lower-mid blends. When enough water is present in the fuel, the aluminum will react preferably with water to produce aluminum oxide, repairing the protective aluminum oxide layer, which is why the corrosion stops. The aluminum alcoholate/alkoxide does not make a tight oxide layer, which is why the corrosion continues. In other words, water is essential to repair the holes in the oxide layer. Based on the Japanese/German results, a minimum of 2 vol.% or 2.52% m/m water is currently proposed in the revision of the hydrous ethanol specification for blending in petrol at E10+ levels. Water injection has additional positive effects on the engine performance (thermodynamic efficiency) and reduces overall CO2 emissions.[citation needed]

 
hE15 promotion Amsterdam

Overall, a transition from anhydrous to hydrous ethanol for gasoline blending is expected to make a significant contribution to ethanol's cost-competitiveness, fuel cycle net energy balance, air quality, and greenhouse gas emissions.[91]

The level of blending above 10% (V/V) is chosen both from a technical (safety) perspective and to distinguish the product in Europe from regular unleaded petrol for reasons of taxes and customer clarity. Small-scale tests have shown many vehicles with modern engine types can run smoothly on this hydrous ethanol blend. Mixed tanking scenarios with anhydrous ethanol blends at 5% or 10% level do not induce phase separation. As avoiding mixing with E0, in particular at extremely low temperatures, in logistic systems and engines is not recommended, a separate specification for controlled usage is presented in a Netherlands Technical Agreement NTA 8115. The NTA 8115 is written for a worldwide application in trading and fuel blending.[92]

E20, E25

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Historical evolution
of ethanol blends used in Brazil
1931–2010(Selected years only)
YearEthanol
blend
YearEthanol
blend
1931E52003E20-25
1966E252004E20
1976E112005E22
1978E18-20-232006E20
1981E20-12-202007E23-25
1987-88E222008[93]E25
1993-98E222009[93]E25
2000E202010[94]E20-25
2001E222011[95]E18-E25
2015E18-E27.5
Source: 1937–2007, J.A. Puerto Rico (2007), Table 3.8, pp. 81–82[96]
Note: The 2010 reduction from E25 to E20 was temporary and took
place between February and April.[94] The lower limit was reduced
from 20% to 18% in April 2011.[95][97]

E20 contains 20% ethanol and 80% gasoline, while E25 contains 25% ethanol. These blends have been widely used in Brazil since the late 1970s.[96] As a response to the1973 oil crisis, the Brazilian government made mandatory the blend ofethanol fuel with gasoline, fluctuating between 10% and 22% from 1976 until 1992.[96] Due to this mandatory minimum gasoline blend, pure gasoline (E0) is no longer sold in Brazil. A federal law was passed in October 1993 establishing a mandatory blend of 22%anhydrous ethanol (E22) in the entire country. This law also authorized the Executive to set different percentages of ethanol within pre-established boundaries, and since 2003, these limits were fixed at a maximum of 25% (E25) and a minimum of 20% (E20) by volume.[30][96] Since then, the government has set the percentage on the ethanol blend according to the results of thesugarcane harvest and ethanol production from sugarcane, resulting in blend variations even within the same year.[96]

Since July 1, 2007, the mandatory blend was set at 25% ofanhydrous ethanol (E25) by executive decree,[93] and this has been the standard gasoline blend sold throughout Brazil most of the time as of 2011.[98] However, as a result of a supply shortage and the resulting high ethanol fuel prices, in 2010, the government mandated a temporary 90-day blend reduction from E25 to E20 beginning February 1, 2010.[94][99] As prices rose abruptly again due to supply shortages that took place again between the 2010 and 2011 harvest seasons, some ethanol had to be imported from the United States, and in April 2011, the government reduced the minimum mandatory blend to 18%, leaving the mandatory blend range between E18 and E25.[95][97]

 
A blender pump is a multifuel blend dispenser that allows customers to choose between E20, E30, E85, or any other preselected blend.

All Brazilian automakers have adapted their gasoline engines to run smoothly with this range of mixtures, thus, all gasoline vehicles are built to run with blends from E20 to E25, defined by local law as "common gasoline type C".[100][101] Some vehicles might work properly with lower concentrations of ethanol, but with a few exceptions, they are unable to run smoothly with pure gasoline, which causesengine knocking, as vehicles traveling to neighboring South American countries have demonstrated.[102]Flex-fuel vehicles, which can run on any type of gasoline E20-E25 up to 100%hydrousethanol (E100 or hydrated ethanol) ratios,[103] were first available in mid-2003. In July 2008, 86% of all new light vehicles sold in Brazil were flexible-fuel, and only two carmakers build models with a flex-fuel engine optimized to operate with pure gasoline (E0):Renault with the modelsClio,[102][104]Symbol,Logan,Sandero andMégane, andFiat with theSiena Tetrafuel.[105][106]

Thailand introduced E20 in 2008,[107] but shortages in ethanol supplies by mid-2008 caused a delay in the expansion of the E20 fueling station network in the country.[108] By mid-2010, 161 fueling stations were selling E20, and sales have risen 80% since April 2009.[109] The rapid growth in E20 demand is because most vehicle models launched since 2009 were E20-compatible, and sales of E20 are expected to grow faster once more local automakers start producing small, E20-compatible, fuel-efficient cars. The Thai government is promoting ethanol usage through subsidies, as ethanol costs fourbaht (about 12 US cents) a litre more than gasoline.[109]

A state law approved inMinnesota in 2005 mandated that ethanol comprise 20% of all gasoline sold in this American state beginning in 2013. Successful tests have been conducted to determine the performance under E20 by current vehicles and fuel dispensing equipment designed for E10.[110] However, this mandate was later delayed to 2015, and has never taken effect because the federalEPA has yet to authorize the use of E20 as a replacement for gasoline.

A study commissioned byBP and published in September 2013, concluded that the use ofadvanced biofuels in the UK, and particularly E20cellulosic ethanol, is a more cost-effective way of reducing emissions than usingplug-in electric vehicles (PEVs) in the timeframe to 2030. The study also found that the use of higher blends of biofuels is complementary tohybrid electric vehicles (HEVs) andplug-in hybrids (PHEVs).Battery electric vehicles (BEVs) can deliver strong CO2 savings with a decarbonised electric grid, but are expected to have significantly higher costs thaninternal combustion engine vehicles and hybrid cars to 2030, as the latter are expected to be the most popular models by 2030. According to the study, in 2030 an E20 blend in an HEV can achieve a 10% emission savings compared to an HEV running on E5, for an annual fuel cost premium of£13 compared to an annual cost of£195 for an all-electric car.[111][112]

E70, E75

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When the vapor pressure in the ethanol blend drops below 45 kPa, fuel ignition cannot be guaranteed on cold winter days, limiting the maximum ethanol blend percentage during the winter months to E75.[113]

E70 contains 70% ethanol and 30% gasoline, while E75 contains 75% ethanol. These winter blends are used in the United States and Sweden for E85flexible-fuel vehicles during the cold weather, but still sold at the pump labeled asE85.[114] The seasonal reduction of the ethanol content to an E85 winter blend is mandated to avoid cold starting problems at low temperatures.[114][115]

In the US, this seasonal reduction of the ethanol content to E70 applies only in cold regions, where temperatures fall below 32 °F (0 °C) during the winter.[116][117] InWyoming for example, E70 is sold as E85 from October to May.[114][118] In Sweden, all E85 flexible-fuel vehicles use an E75 winter blend.[115] This blend was introduced since the winter 2006-07 and E75 is used from November until March.[119]

For temperatures below −15 °C (5 °F), all E85 flex vehicles require an engine block heater to avoid cold starting problems.[119] The use of this device is also recommended for gasoline vehicles when temperatures drop below −23 °C (−9 °F).[120] Another option when extreme cold weather is expected is to add more pure gasoline in the tank, thus reducing the ethanol content below the E70 winter blend, or simply not to use E85 during extreme low temperature spells.[119][120]

E85

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Typical yellow cap used for the fuel filler cap of U.S. vehicles built to use theE85 blend
Further information:E85

E85, a mixture of 85% ethanol and ~15% gasoline, is generally the highest ethanol fuel mixture found in the United States and several European countries, particularly in Sweden, as this blend is the standard fuel forflexible-fuel vehicles. This mixture has anoctane rating of 108, however, the Ethanol molecule also carries with it anoxygen atom, where-as gasoline does not, effectively requiring the internal combustion engine to ingest less air per unit-volume by its own accord, which reduces pumping losses, and further increases theexo-thermic chemical reaction. Ethanol fuel is considered – although not widely known as – a form of "chemical supercharging", similar to that ofNitrous Oxide (N2O) &Nitromethane (CH3NO2).

 
Logo used in the United States forE85 fuel

The 85% limit in the ethanol content was set to reduce ethanol emissions at low temperatures and to avoid cold starting problems during cold weather, at temperatures lower than 11 °C (52 °F).[116] A further reduction in the ethanol content is used during the winter in regions where temperatures fall below 0 °C (32 °F)[117] and this blend is called Winter E85, as the fuel is still sold under the E85 label. A winter blend of E70 is mandated in some regions in the US,[114][118] while Sweden mandates E75.[115][119] Some regions in the United States now allow E51 (51% ethanol, 49% gasoline) to be sold as E85 in the winter months.

As of October 2010, nearly 3,000 E85 fuel pumps were in Europe, led by Sweden with 1,699 filling stations.[121][122] The United States had 3,354 public E85 fuel pumps located in 2,154 cities by August 2014, mostly concentrated in theMidwest.[123]

Thailand introduced E85 fuel by the end of 2008, and by mid-2010, only four E85 filling stations were available, with plans to expand to 15 stations by 2012.[109]

A major restriction hampering sales of E85 flex vehicles or fuelling with E85, is the limited infrastructure available to sell E85 to the public, as by 2014 only 2 percent of motor fuel stations offered E85,[124] up from about 1 percent in 2011.[125] As of November 2015[update], there were only 3,218 gasoline fueling stations selling E85 to the public in the entire U.S.,[126] while about 156,000 retail motor fuel outlets do not offer the E85 blend.[124] The number of E85 grew from 1,229 in 2007 to 2,442 in 2011, but only increased by 7% from 2011 to 2013, when the total reached 2,625.[124] There is a great concentration of E85 stations in theCorn Belt states, and as of November 2015[update], the leading state isMinnesota with 274 stations, followed byMichigan with 231,Illinois with 225,Iowa with 204,Indiana with 188,Texas with 181,Wisconsin with 152, andOhio with 126. Only eight states do not have E85 available to the public,Alaska,Delaware,Hawaii,Montana,Maine,New Hampshire,Rhode Island, andVermont.[127] The main constraint for a more rapid expansion of E85 availability is that it requires dedicated storage tanks at filling stations,[120] at an estimated cost ofUS$60,000 for each dedicated ethanol tank.[128] A study conducted by the U.S. Department of Energy concluded that every service station in America could be converted to handle E85 at a cost of $3.4 billion to $10.1 billion.

ED95

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ED95 designates a blend of 95% ethanol and 5% ignition improver; it is used in modifieddiesel engines where high compression is used to ignite the fuel,[129] as opposed to the operation of gasoline engines, wherespark plugs are used. This fuel was developed by Swedish ethanol producerSEKAB.[129] Because of the high ignition temperatures of pure ethanol, the addition of ignition improver is necessary for successfuldiesel engine operation. A diesel engine running on ethanol also has a higher compression ratio and an adapted fuel system.

 
ED95 bus in Sweden running on a modifieddiesel engine

This fuel has been used with success in many SwedishScania buses since 1985, which has produced around 700 ethanol buses, more than 600 of them to Swedish cities, and more recently has also delivered ethanol buses for commercial service in Great Britain, Spain, Italy, Belgium, and Norway.[130] As of June 2010Stockholm has the largest ethanol ED95 bus fleet in the world.[130][131]

As of 2010, the Swedish ED95 engine is in its third generation and already has complied withEuro 5 emission standards, without any kind of post-treatment of the exhaust gases. The ethanol-powered engine is also being certified as environmentally enhanced vehicle (EEV) in the Stockholm municipality. The EEV rule still has no date to enter into force in Europe and is stricter than the Euro 5 standard.[132]

Nottingham became the first city in England to operate a regular bus service with ethanol-fuelled vehicles. Three ED95 single-deck buses entered regular service in the city in March 2008. Soon after,Reading also introduced ED95 double-deck buses.[133]

Under the auspices of theBioEthanol for Sustainable Transport project, more than 138 bioethanol ED95 buses were part of demonstration trial at four cities, three in Europe, and one in Brazil, between 2006 and 2009.[2][134][135] A total of 127 ED95 buses operated inStockholm, five buses operated inMadrid, three inLa Spezia, and one in Brazil.[2]In Brazil, the first Scania ED95 bus with a modified diesel engine was introduced as a trial inSão Paulo city in December 2007, and since November 2009, two ED95 buses were in regular service.[135][136][137][138] The Brazilian trial project ran for three years and performance and emissions were monitored by the National Reference Center on Biomass (CENBIO-Portuguese:Centro Nacional de Referência em Biomassa) at theUniversidade de São Paulo.[139]

In November 2010, the municipal government ofSão Paulo city signed an agreement withUNICA,Cosan, Scania andViação Metropolitana, a local bus operator, to introduced a fleet of 50 ethanol-powered ED95 buses by May 2011. Scania manufactures the bus engine and chassis in its plant located inSão Bernardo do Campo, São Paulo, using the same technology and fuel as the ED95 buses already operating inStockholm. The bus body is a Brazilian CAIO.[140][141] The first ethanol-powered buses were delivered in May 2011, and the 50 buses will start regular service in June 2011 in the southern region of São Paulo.[139] The 50 ED95 buses had a cost ofR$ 20 million (US$12.3 million) and due to the higher cost of the ED95 fuel and the lower energy content of ethanol as compared to diesel, one of the firms participating in the cooperation agreement, Raísen (a joint venture betweenRoyal Dutch Shell andCosan), supplies the fuel to the municipality at 70% of the market price of regular diesel.[139][142]

E100

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Not to be confused withEau de cologne.
 
Typical Brazilian flexible-fuel engine with secondary gasoline reservoir for cold starting the engine at temperatures below 15 °C (59 °F)
 
The Brazilian 2008Honda Civicflex-fuel has outside access to the secondary reservoir gasoline tank in the front right side shown by the arrow.

E100 is pureethanol fuel. Straighthydrous ethanol as anautomotive fuel has been widely used in Brazil since the late 1970s for neat ethanol vehicles[96][143] and more recently for flexible-fuel vehicles.[144][145] The ethanol fuel used in Brazil is distilled close to theazeotrope mixture of 95.63%ethanol and 4.37% water (by weight) which is approximately 3.5% water by volume.[146]The azeotrope is the highest concentration of ethanol that can be achieved by simplefractional distillation. The maximum water concentration according to theAgência Nacional do Petróleo (ANP) specification is 4.9 vol.% (approximately 6.1 weight%)[147] The E nomenclature is not adopted in Brazil, but hydrated ethanol can be tagged as E100, meaning it does not have any gasoline, because the water content is not an additive, but rather a residue from the distillation process. However, straight hydrous ethanol is also called E95 by some authors.[148][149]

The first commercial vehicle capable of running on pure ethanol was theFord Model T, produced from 1908 through 1927. It was fitted with acarburetor with adjustable jetting, allowing use of gasoline or ethanol, or a combination of both.[120][150][151][152] At that time, other car manufacturers also provided engines for ethanol fuel use.[120] Thereafter, and as a response to the1973 and1979 energy crises, the first modern vehicle capable of running with purehydrous ethanol (E100) was launched in the Brazilian market, theFiat 147,[153] after testing with several prototypes developed by the Brazilian subsidiaries ofFiat,Volkswagen,General Motors andFord.[143] As of September 2012[update], there were 1.1 million neat ethanol vehicles still in use in Brazil.[154] Since 2003, Brazilian newer flex-fuel vehicles are capable of running on pure hydrous ethanol (E100) or blended with any combination of E20 to E27.5 gasoline[144][145] (a mixture made with anhydrous ethanol), the national mandatory blend.[30][93] As of September 2012[update], there were 17.1 million flexible-fuel vehicles running on Brazilian roads.[154]

E100 imposes a limitation on normal vehicle operation, as ethanol's lower evaporative pressure (as compared to gasoline) causes problems when cold starting the engine at temperatures below 15 °C (59 °F).[155] For this reason, both pure ethanol and E100 flex-fuel vehicles are built with an additional small gasoline reservoir inside the engine compartment to help in starting the engine when cold by initially injecting gasoline. Once started, the engine is then switched back to ethanol.[155] An improved flex-fuel engine generation was developed to eliminate the need for the secondary gas tank by warming the ethanol fuel during starting,[156][157] and allowing them to start at temperatures as low as −5 °C (23 °F),[158] the lowest temperature expected anywhere in the Brazilian territory.[159] ThePolo E-Flex, launched in March 2009, was the first flex-fuel model without an auxiliary tank for cold start. The warming system, called Flex Start, was developed byRobert Bosch GmbH.[160][161]

Swedish carmakers have developed ethanol-only capable engines for the newSaab Aero X BioPower 100 Concept E100, with a V6 engine which is fuelled entirely by E100 bioethanol,[162][163] and the limited edition of theKoenigsegg CCXR, a version of theCCX converted to use E85 or E100, as well as standard 98-octane gasoline, and currently the fastest and most powerful flex-fuel vehicle with its twin-superchargedV8 producing 1018 hp when running on biofuel, as compared to 806 hp on 91-octane unleaded gasoline.[164][165]

The higherfuel efficiency of E100 (compared to methanol) in high performancerace cars resulted inIndianapolis 500 races in 2007 and 2008 being run on 100% fuel-grade ethanol.[166]

Use limitations

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Modifications to engines

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The use of ethanol blends in conventional gasoline vehicles is restricted to low mixtures, as ethanol-gasoline is corrosive and can degrade some of the materials in the engine and fuel system. Also, the engine has to be adjusted for a highercompression ratio as compared to a pure gasoline engine to take advantage of ethanol's higher oxygen content, thus allowing an improvement infuel efficiency and a reduction of tailpipe emissions.[113] The following table shows the required modifications to gasoline engines to run smoothly and without degrading any materials. This information is based on the modifications made by the Brazilian automotive industry at the beginning of the ethanol program in that country in the late 1970s, and reflects the experience ofVolkswagen do Brasil.[167]


Required adjustments to gasoline engines to cope with different blends of ethanol fuel[168][113]
Ethanol
blend
CarburetorFuel InjectionFuel pumpFuel
pressure
device
Fuel filterIgnition systemEvaporative
system
Fuel
tank
Catalytic converterBasic
engine
Motor oilIntake
manifold
Exhaust systemCold
start
system
≤ 5%Modifications not necessary for any vehicle
E5 to E10Modifications not necessary for vehicles since about 1987-92
E10 to E25Specially designed vehicles
E25 to E85Specially designed vehicles
E85 to E100Specially designed vehicles
Modifications not necessary
Modifications probably necessary


Disadvantages to ethanol fuel blends when used in engines designed exclusively for gasoline include lowered fuel mileage, metal corrosion, deterioration of plastic and rubber fuel system components, clogged fuel systems, fuel injectors, and carburetors, delamination of composite fuel tanks, varnish buildup on engine parts, damaged or destroyed internal engine components, water absorption, fuel phase separation, and shortened fuel storage life.[169][170][171] Many major auto, marine, motorcycle, lawn equipment, generator, and other internal combustion engine manufacturers have issued warnings and precautions about the use of ethanol-blended gasolines of any type in their engines,[172] and theFederal Aviation Administration and major aviation engine manufacturers have prohibited the use of automotive gasolines blended with ethanol in light aircraft due to safety issues from fuel system and engine damage.[169][170][171][173]

Other disadvantages

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Combustion of ethanol gives someacetaldehyde, which is an irritant. Ethanol is not miscible with gasoline at low temperatures, e.g. in cold regions of the planet. It is also leads to deposits.[174]

See also

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Notes

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  1. ^Though mandated only in 10 states, ethanol blends in the U.S. are available in other states as optional or added without any labeling, making E blends present in two-thirds of the U.S. gasoline supply.[23][24]
  2. ^Actual blend is subject to ethanol availability. Blend for 2021 was 120% and expected to reach 12% in 2022[25]
  3. ^Started in late 2011 inGuadalajara. Scheduled forMonterrey andMexico City in 2012.[26]
  4. ^Starting on December 15, 2010.[33]
  5. ^The State of Oregon exempted premium unleaded gasoline (91octane or higher) from the 10% ethanol mandate for road use since January 2010.[37]
  6. ^Actual blend is 7.8% ethanol (E8) and mandatory only in certain regions. Sales of E8 began in April 2010 in nine regions in northern Peru, and in July 2011 in theLima-Callao metropolitan area.[40]
  7. ^E5 is scheduled to be phased out in 2013
  8. ^In Colombia mandatory blend was enforced only in cities with more than 500.000 inhabitants.[43]
  9. ^Mandatory blend scheduled for 2009 was postponed. Sales of E7 continue in the original trial region in theGuanacaste Province and six municipalities in thePuntarenas Province.[49] Nationwide availability rescheduled to begin in June 2012.[50]
  10. ^Since November 1, 2008 became available in some cities and will become mandatory in May 2009.
  11. ^Actual blend is subject to ethanol availability

References

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  2. ^abcBEST Cities and Regions (2009)."BioEthanol for Sustainable Transport: Results and recommendations from the European BEST project"(PDF). Environmental and Health Administration, City of Stockholm. Archived fromthe original(PDF) on 2010-09-30. Retrieved2011-05-29.
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