A car fuel mileage calculator is available online on fueleconomy.gov, a United States federal website that provides authoritative information regarding fuel economy. The site also includes a link to money saving tips on future fuel costs.
In the U.S., fuel economy in gasoline-driven vehicles is measured in units of miles per gallon (mpg). To use My Trip Calculator on fueleconomy.gov, select the year, make, model and if applicable, the transmission type of the vehicle. The results provided by the calculator include the fuel type, price and mpg. Users can also conveniently compare a vehicle's fuel mileage to other cars by doing three calculations at a time.