Originally Posted by skinnison

I am sure all of this is true. To be clear however, tires make a major difference. I track my mileage/fuel economy every week. The week I changed my tires, (last November) I lost about 50 miles per tank, give or take a few. The temp. did not drop that week. Keep in mind these are studed winter tires. My point was that a less aggresive tred will lead to better mileage.