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I personally think the numbers are fair. As long as, they use 1 US gallon equals 125,000 btu's, 115,000 btu's equals 33.7 kWh (from wiki linked above in another person's post). Using these numbers, 36.6 kWh equals 1 US gallon of gasoline. An electric motor has heat loss just the same as the gas engine. It is just much less.
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