Wh/mile would work for EV's. But how would you then compare it to hybrids, or ICE powered cars?
The MPGe (miles per gallon equivalent) uses a BTU equivalency of various fuels and electricity to make it possible to compare E10, E85, diesel, hybrids, plugin hybrids, and "pure" electric cars, in a way that is familiar to most people. It isn't perfect, but it seems to be the best way to do this.
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