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If people want to talk about how much energy is wasted when charging, refining crude is not an energy free operation either. As a start, about 24% of a standard 42 gallon barrel of crude is lost during refining. There are other energy costs like drilling, shipping, shipping the gasoline, electricity to pump the gasoline etc..
This is not to say it is more or less efficient. But if you want to point out energy loss when charging, you need to look at the energy expended to pump gas.
It becomes a pretty complicated endeavor, so MPG and MPGe are used.
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