Has anyone had any experience with Sumitomo LSH tires as replacements for Dunlop S/P's? I replaced the 2 rears because of punctures and kept the Dunlop S/P's on the front. No change in gas mileage (40.7-41.1 mpg) with the new tires in the rear for approx. 2 weeks. After I had the 30k and a fuel injection service, I consented to moving the new tires to the front. Since then my mileage has dropped to 39.6. The dealer is contending that the tires are the culprit; my contention is the fuel service. Anyone have a similar experience?