Can somebody explain why my winter set of wheel/tires gets better mileage in almost summer temperatures? At 14-17C+, my winter tires give me 29 avg on a test route, while summer gives a ~24 avg. I expect quite opposite numbers at this temperature. What could be the reason?
I have a VW Passat with 2 sets of wheels/tires:
- Summer 18 inch with Hankook Ventus v12.
- Winter 16 inch with Michelin Xice3.
The weight difference is #1 20.1kg vs #2 20.0kg. Circumference difference with current thread wear is within 1 inch.