For most drivers, a trip to the fuel pump is an easy reminder of the day-to-day cost of gasoline or diesel fuel. But for electric vehicle (EV) drivers, who typically charge their car at home, there isn’t a similar measurement to determine the cost of driving on electricity. To help both current and potential EV drivers better understand the cost of driving an EV, the Energy Department created the eGallon.
The eGallon represents the cost of fueling a vehicle with electricity compared to a similar vehicle that runs on gasoline. For example, if gasoline costs $3.60 a gallon in your state and the eGallon price for your state is $1.20, that means that for $1.20 worth of electricity you can drive the same distance as you would for $3.60 worth of gasoline.
To determine the eGallon price for each state, we calculate how much electricity the most popular EVs would require to travel the same distance as similar models of gasoline-fueled vehicles would travel on a gallon of gasoline. That amount of electricity is then multiplied by the average cost of electricity for the state. This gives consumers a clear comparison of the cost of driving on electricity vs. a similar sized car that uses gasoline.