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the thermos flask for hot start up idea would work with a 20litre tank. from my biodiesel days, i know that a 20litre tank should keep its heat over-night if insulated. if its positioned in the passenger footwell the escaping heat would nicely warm the car. but would the weight be an issue?
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I wouldn't think so. How much would your insulated tank weigh + 40 lbs coolant.
I'm not getting what you would do with the steam engine, and when you'd run it?
I dimly recall reading something about BMW experimenting with steam heat recovery.