So why are making wild assumptions and just tossing out 50% of the energy that is being used? just because we feel like it!
After all, gas cars have to run off a heat engine, so lets use their poor performance to drag down the math on electric cars too, after all I bet no one who owns an electric car has ever charged it using solar or wind and that doesn't work in to our nice simple "lets just toss out 50% of your energy" theory, so we will just ignore it all together.
If you were to pole electric vehicle owners I would bet that a large percentage of them charge with renewable energy.
I thought that the reason for finding a common factor like BTU was so you could make the math more reliable and if reliable math is what we are looking for tossing in randomness then makes total sense.
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