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Old 04-26-2009, 11:40 PM   #11 (permalink)
Left Lane Ecodriver
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Prius C - '12 Toyota Prius C
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There's a good discussion of this topic on Wikipedia, at Miles per gallon of gasoline equivalent - Wikipedia, the free encyclopedia
You could make a case for heat-equivalent, extractable energy equivalent, dollar-equivalent, or CO2-equivalent methods for comparing gas to electric. I'm inclined to favor CO2 methods, using the average US carbon intensity of electricty, which I think is .6kgCO2/KWh. With gasoline at 2.421kgCO2/gal, you have 4KWh/gal.

So I'd say Ryland is getting 14mpg(CO2equiv, US average electric mix).

As I've said in other threads, electric cars don't reduce CO2 emissions by themselves. Low-carbon electric generation is required.

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