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If the xprize style mpge is based on carbon it assumes that our grid is 2/3 carbon neutral. Ridiculous. I know people like to say that our grid will be like that in the future but hey so will liquid fuels.. The conversion seems unfair to me.
For comparing gas to gas or electric to electric the mpg or kwh will give me relative costs. Comparing between the two to find relative costs does change depending on where you live. I know my electric rates and gas prices, i think most people do, so monetary cost for where i live is easyfor figure. Co2 or environmental or political costs arent' so easy but still important.
MPGE conversions should either be based on reasonable though imperfect conversion assumptions or shouldnt bother be used.
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