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I have been doing my electric motorcycle fuel economy based on converting both gasoline and KWh into BTUs.
Electricity is measured from the wall, which takes charger efficiency into account - which is good, it encourages people to use an efficient charger.
My cost per mile is right about at 1 cent, so figuring economy based on price of gas is real easy - just move the decimal point in the gas prices over two places.
I usually state my economy based on the electric to BTU conversion as stated in MPG - right around 300 MPG. Then I say that "but based on the COST of gasoline, it gets the equivelent of..."
I also mention how electricity can be made from solar, wind, etc. while gasoline cannot.
There really doesn't seem to be any good standard to stating "gas mileage" of an EV to the masses. Watt-hour per mile is good to use for electric vehicle folks, but I think it is worth it to convert to MPG for everyone else.
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