A standard measure of the rate of motor vehicle fuel consumption, expressed as the total distance traveled divided by the amount of gasoline fuel consumed in doing this.

A general statement of this is based on the average mileage traveled per unit of fuel for a class of vehicles; for example, a certain car type in a given model year.

Fuel economy is most often measured by the distance a vehicle can travel with a given volume of fuel. In the U.S., fuel economy is measured in vehicle miles per gallon of fuel. In the European Union, liters per 100 kilometers is the preferred measure.