Miles per gallon gasoline equivalent
Miles per gallon gasoline equivalent refers to the fuel efficiency of electric vehicles that compares how far a car can go with how much energy is in a gallon of gasoline. Is is a slightly arbitrary measurement, as efficiency for gasoline engines is radically different from electric motors. It is an attempt to compare apples to oranges, as the challenges of fuel efficiency for a heat engine-powered car are completely different from the challenges of energy efficiency for an electric car.
When testing Electric vehicles for fuel economy, the United States EPA uses a standard of 115,000 BTU of energy per gallon of gasoline, which converts to 33.7 kWh.[1] They then calculate a value for how much energy it takes the EV to travel 100 miles. To get the final MPGe measurement, they divide 33.7 kWh by the 100-mile energy use value, then multiply by 100.
Nissan Leaf energy usage (kWh/100 mi) = 29comb.