Auto AC and heater question
I saw a reader post that she was being frugal by not using her car heater in the winter, or her AC in the car in the summer. How is this being frugal? I thought the heater used heat coming off the engine as its main sorce. I thought that having your windows down (esp for highway driving) caused more drag and more gas usageage than the AC did. Any mechanics out there who can answer this one?
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