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Until the engine is fully warmed up, running the heat will hurt your mileage. Cold engine = less mpg. Running the heater will slow the warming process, so more time is spent with the engine cold. Even having the temp set to heat, without any fan, will take some heat from the cooling system.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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