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I thought I just posted on this recently. I think it works out that to store the waste heat from a couple of gallons of gasoline (including exhaust heat) you want a tank with several hundred pounds of water. However, for short to medium trips, bringing the heat home for the house makes sense. You could eliminate the radiator, and aim to have the tank just full enough that it would come to a boil as you got home. If you guess short, there's lots of water to boil off for cooling, and you can vent the exhaust heat. With no cooling intake, drag could be lower, offsetting the weight.
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