I get bad fuel mileage in winter, it takes my car easily 10-15minutes to warm up.. and by that time I can be at my destination. It depends on how cold it is for me, if I want to try to have the cabin warm or not.
But my heater sucks and you can't use it until the car is warm even then it doesn't blow hard. Once with it on I drove about 30 highway miles and the car still was cold.. so I turned it off the the gauge finally went to were it was supposed to be. (who knows?)
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