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Carbon is energy, in this case!
You take a 80-90% efficient motor, and it will beat a 20-30% efficiency engine every time.
The MPGe numbers in the X-Prize are apples-to-apples. The electric cars are using a lot less energy on average than the ICE powered cars.
Take the 7.5kWh per gallon of gasoline, and use it instead directly in an EV and you go farther -- and you'll save all the gasoline.
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