Grip/rolling resistance is probably one factor. I think "winter tires" are designed to be "stickier" -- to "grip the road better" -- which requires the car to expend more energy to push the vehicle forward. My Prius has specially designed Low Rolling Resistance all-weather tires as one of several factors meant to decrease fuel consumption (which is the only reason I know anything about the subject) ....
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timeasmymeasure
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Date: 2008-05-09 05:48 pm (UTC)