According to the EPA, burning one gallon of gasoline produces 115,000 BTUs (British thermal units). It takes 33.7 kilowatt-hours (kWh) of electricity to generate the same amount of heat. This shows just how incredibly energy-dense gasoline can be. Even the bigger EV battery packs can only store the equivalent energy of around three gallons of gas. Despite that, electric vehicles trump ICEs in the efficiency department.
This is because the inherent efficiency of a combustion engine barely gets to 40%. In comparison, electric motors can convert more than 85% of electricity into mechanical energy. That’s why you see values of more than 100 MPGe (miles per gallon equivalent) in the case of electric vehicles, while the ICEs show much lower ratings. This is not a fantasy because 100 MPGe means an electric car can travel 100 miles on 33.7 kWh of electricity, or the equivalent of a gallon of gas.
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