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I don't think a sump heater would work as the Jazz has an in sump transmission with the casing all webs, etc.
Using supplemental heating in the garage is illegal and dangerous, owing to the houses immediately attached to the garage and lack of flue. I cannot run a generator to supply power for that very reason (not that that would be an efficient way of saving a few mpg).
Because it never gets really cold here and because my cold start trip is only 4 miles and 10 minutes duration, I don't feel I would gain much from getting the engine hotter, quicker, on the trip. Only real benefit would be if I could have it warm to start with.
Perhaps I will just have to live with it. At over 50 mpg UK at the moment, any gains I make may not be economically viable (never mind the humping of batteries and all that rigmarole).
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