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colder tempatures cause longer warm up times. when an engine is cold, it requires more fuel to maintain a smooth idle and good power. Also cold air is denser, which means that the wind resistance drag on the car is higher. And the rolling resistance of the tires is greater when they are colder, and the roads in some places are more often wet, which also increases rolling resistance.

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Q: Why does the mpg go down in the winter?
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