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So 3 hours of a heater being plugged in draws about 2kwh, or enough to push an electric car 4-6 miles on a good warm day... maybe half that in the winter, seeing as how you are asking your gas engine to work in less the ideal weather we should be fare here.
It seems like someone should be able to set their scan gauge to show water temp (as that is what the block heater would heat) and average mpg for that trip, do a warm and a cold test when it's -0F out and give us some feed back? I don't have any mpg read out for my own personal vehicles so I can't do this at this time.
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