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One thing that may impact your fuel economy is setting your airflow to "defrost" rather than thru the panel or floor vents. In order to reduce the number of AC compressor failures, selecting the "Defrost" setting engages your AC clutch, keeping your AC system lubricated through the cold weather. Many cars will cycle on and off, many will stay engaged for as long as defrost is engaged. So, to save fuel, only use your defrosters as long as neccessary, then switch to the panel or floor vents.
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