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Well for me personally since I keep my truck in a heated garage I normally gain mpg in winter from the colder air, not much but enough to notice. If you want to have an easier time in smaller cars you should change ALL the fluids and grease (trans, diff, bearing, oil, TC, brakes) to full synthetic so that they don't get a solid in cold weather and come up to operating temp faster. Prevents that feeling of everything in the drivetrain resisting movement for the first few minutes
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