Running the heater in mixed mode causes the compressor to run, which reduces gas mileage. But which part is causing the compressor to run: the floor vent or near the windshield? Or more specifically, how should I run the heater to optimize gas mileage?
Whenever the defroster is on, it is running the Air Conditioning (provided that the outside temperature is above 40 degrees). This is to remove the moisture from within the vehicle. The cut off temperature may vary per make of vehicle.
Bob, The Auto Answer Man
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