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The wax sounds like a useful refinement to reduce weight, although it can't be pumped itself.
Great minds think alike: I'd actually posted this on another list recently, not here:
The waste heat from a gallon of gas would raise the temperature of 400 kg of water from near room temperature to near boiling. That's less weight than many battery packs, and it can be pumped into the house, replacing up to 3/4 gallon of fuel oil. The tank could be filled according to the trip planned, aiming to have it almost boil.
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