ed5000 wrote:As for fuel economy, I'm not so sure there's that much difference. Round trip to work and back (about 33 miles) costs me 8 or 9 bars from a full charge with either the Dunlops or the Yoko's but it's funny because the range remaining gauge says I can only go 63 miles on a full charge now compared to the older Dunlop's 70 miles range. Not very scientific but I think tire diameters are just different.
New tires are always significantly larger in both diameter and circumference than old worn tires and that throws lots of things off. Since the speedometer and odometer are almost always based on the number of revolutions a tire makes, both those change when you install new tires. The effective gear ratio also changes which affects fuel economy
When you wear a tire down from 10 or 11/32nds of tread down to 2 or 3/32nds, you've worn away around 1/4 inch of tread and the diameter of the tire is 1/2 inch smaller, which makes the circumference about an inch and a half smaller . . . . and that changes just about everything
Going from LRR tires to non LRR tires could make an even bigger change - An estimated loss of fuel economy (range in our case) of about 4% for urban driving and 7% for highway driving