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OK, I was just going from memory. Bottom line, though, is that you're probably not going to get much more heat from it than you would from the cigarette lighter.
Quite aside from that, a lot of this discussion puzzles me. This board is supposed to be about using less energy, no? So how much excess electricity would go into running an electric cabin heater? Or even a block heater, if it's left on for long periods?
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