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2 hours and its up to 104f. The 400W heater cost me 11.2c to heat it this far. I would hope to save more than that in my commute. By my calcs i would have to go from 3L/100k to 2.8L/100k to break even. Hmm....pumping the heater might be better able to offset the heat loss due to it (hopefully) heating quicker.
ollie
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