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.
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