Is it necessary to change between snow and summer tires, or just have all season?
Snow and Summer tires... on 2009 Toyota Prius
Tire rolling resistance makes a difference in fuel consumption on many hybrid cars. Some car manufacturers initially put low rolling resistance tires on there cars. Many people put a more performance tire on there car afterward that may give better handling and performance but may be at the expense of fuel efficiency.
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Depends if the tires you have now has snow studs then you would probably want to put a least all season tires on in the summer