Ford Focus Forum, Ford Focus ST Forum - View Single Post - Winter Fuel Econcomy
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Old 12-03-2012, 06:54 AM   #2
BetaDnB
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Colder air is more dense (as you stated) which requires more fuel for proper ignition. It also makes it more difficult for the car to cut through the air (aerodynamics). 2 mpg isn't bad of a drop. I lose about 5 mpg in winter also only using ethanol free.
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