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I do want to do a source-to-wheels comparison; but this is pretty darn difficult to do. All the numbers I have seen put EV's well ahead of gasoline; even if you have 100% coal generated electricity. And the fact that you *can* get electricity renewably -- which is impossible to do with gasoline; makes it get better and better as we move to renewables for electricity.
The reason that I have heard stated against MPGe is that it isn't "fair" to ignore the source of electricity -- and for pollution considerations, I agree. BUT, the *same* thing must be applied to gasoline, to be completely fair.
So, MPGe based on BTU's works fine to compare the relative efficiencies between vehicles. But for carbon footprint comparisons, a lot more has to be done.
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