A gallon of fuel contains a fixed amount of usable energy. Motion from point A to point B uses a minimal amount of energy. MPG equivalent is a perfectly reasona

A gallon of fuel contains a fixed amount of usable energy. Motion from point A to point B uses a minimal amount of energy. MPG equivalent is a perfectly reasonable way to measure the efficiency of electric vehicles, and optimal if you plan to compare them to ICE vehicles. MPG is only a proxy for distance per unit energy anyway.