If you’re already using the car, gas or electric, using the car would he better because you’re already spending that energy.
In any other case, you should use your home. Even if the home is being powered by a gas generator, because that gets you more kWh per gallon than the car would, but the car is designed to move you, not power you.
Also, if you’re off grid and only using combustion for energy, you should really reconsider your options. Solar and wind are basically free once you pay the one time costs.
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