Although that will not be until September 1, unleaded has already increased by 1.5p a litre to 81.5p in the past fortnight as the pressure on crude prices has increased. That is a rise of 7p a gallon to £3.70. Diesel is around 85p a litre, or £3.86 a gallon. The predicted pump rises would see fuel selling close to or even over £4 a gallon - 88p a litre.