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I believe that a KW-h based system on total energy used from wall or fuel pump is much more practical as it allows liquid fuels to be on a more comparable basis with EVs and allows for more accurate FE comparisons. From calculating Kw-h per mile you can calculate cost per mile easier as well. It allows more practical comparisons between the liquid fuels like Diesel, Gasoline, and Ethanol. Diesel doesn't get placed on a shelf while Ethanol looks like a pig. They can be compared and the KW-h per mile will show more accurate results.
Using CO2 to calculate energy consumption is not going to get anywhere, it's just not rational.
Calculating KW-h efficiency is just as important as finding the cost per gallon. If you are paying less per Kw-h but using more Kw-h per mile it isn't paying off. This works for Premium fuel comparisons too, some people have gotten results from using higher octane gasoline. Comparing them by KW-h is just simpler.
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-Allch Chcar
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