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Get a thermos bottle capable of holding approx 2 gallons of coolant mixture, and allow your coolant to circulate through it. Close it off before you shut the engine off, and see how long it will stay warm in the thermos bottle.
Basically, a tank within a tank with the airspace between them evacuated will be sufficient, you can wrap it up with a couple old pairs of jeans for insulation. (Testing purposes, anyway.)
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