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MPGe stands for miles per gallon equivalent and is a way to compare vehicle efficiency regardless of fuel type. Just like MPG measures efficiency based on miles and gallons (of gasoline), MPGe measures how much energy a gallon of gasoline produces when burned.
The standard measurement uses the convention that one gallon of gasoline burned releases 115,000 BTUs (British thermal units) of energy. A BTU is just a way to measure energy (and is what we use to measure air conditioner output). In terms of electric energy, you need 33.7 kilowatt-hours (kWh) to get 115,000 BTUs.
Energy released burning 1 gallon gasoline = 33.7 kWh = 115,000 British Thermal Units
The EPA takes an electric vehicle’s energy consumption per mile (in kWh) and converts it into gasoline equivalent energy units in BTU to compare it to the energy consumption of an internal combustion engine.
In the top left corner of this window sticker, you can see the 98 MPGe rating for the electric-only portion of the vehicle, meaning that if this car ran on gasoline, it would get 98 miles to the gallon. That’s a lot more than even high efficiency internal combustion cars.
In this same box, you can also see the kW-hour equivalent measurement of the car’s efficiency. This is just another way to measure the same thing: how much energy the car uses to drive. The kWh value can be helpful to estimate the cost of recharging your car at home since most utility companies charge based on kWh used.
Since this car is a hybrid, it also has a gasoline-only MPGe rating, which is much lower than the electric one: 38 MPG. Since the gasoline equivalent for a traditional energy is, well, gasoline, the 38 MPG is also 38 MPGe. You can see that by comparing several types of vehicles.
