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I haven't seen any difference in fuel economy between summer tires and snow tires. I do run a narrower tire in the winter.
The stock tires on my VW are 225/45R-17 while the Micheline X-Ice snow tires are 205/55R-16. Wheel weight is the same as the snows are on steel wheels.
I didn't see a change on the Prius either.
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