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I've been camping in the snow before and this retard overthought it and went overkill. All you need is a -10/-25 whatever sleeping bag and a fucking tent. He has a car off the ground and even sealed better from the elements in a car. The only thing he's accomplished is ruining his engine in park (if he's actually running it at night) and draining his battery in 1-2 hours using induction heaters.
Just stay in the fucking sleeping bag and your body heat will keep you warm, insulation costs nothing to run and is more effective than any heating "solution".