Heated seats are really the way to go, at 75 watts each even my electric car with it's small battery pack could sit with heated seats keep you warm for 60 hours if you started out with a full pack, you heat what needs to be heated, using the correct tool for the task, that is something that a gas car is not going to be able to do well because the battery on gas cars is small enough that in the winter you shouldn't really run anything without the engine running.
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