“The U.S. Environmental Protection Agency (EPA) and U.S. Department of Energy (DOE) produce the Fuel Economy Guide to help car buyers choose the most fuel efficient vehicle that meets their needs. This Guide provides annual fuel cost estimates for each vehicle. The estimates
are based on the assumptions that you travel 15,000 miles per year (55% under city driving conditions and 45% under highway conditions) and that fuel costs $2.73/gallon for regular unleaded gasoline and $2.98/gallon for premium. Cost-per gallon assumptions for vehicles that use other fuel types are discussed at the beginning of those vehicle sections.”