Diesel fuel is used to run diesel engines in cars and other vehicles. Diesel car owners are facing the prospect of extra bills to drive into towns and cities as part of efforts to tackle pollution. We'll bring you the latest news and updates here. From April 2019, an ultra low-emission zone will come into force in London while owners across the UK will face a new ‘toxin tax’ in other built-up areas. Find out the most recent information on diesel costs, charges, prices and emissions below.