Re: Gas Mileage Deline
Rolling resistance also increases, as well as your tire pressures declining due to colder temperatures can affect your mileage too. You might want to check your tire pressure to see if there has been a drop since you last checked and possibly raise them up a bit higher to mitigate the cold weather FE drop. Just look at the history of the Prius in my sig, you can see the pitiful tanks from it's first winter.
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