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There are several things that factor into this, driving at night using the lights puts more drag on the alternator, if it's cool enough to need heat the blower will also add more load to the alternator, cooler air is more dense, cooler temperatures effect the viscosity of oil and other fluids. The grease in the wheel bearings will be stiffer causing more rolling resistance. The air pressure in the tires will increase in higher temperatures creating less rolling resistance. The winter blend of gas is already being made which will also effect FE.
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