The only difference between the two tires? At 1,500 miles I had a tire sealant put in my tires that acted as a balancer as well. The guy removed the wheel weights upon installing it and I got more mileage out of the tire than most others did. He has since been bought out and the new owner does not carry the product, but I am still searching for it. It was a white, epoxy looking product that spread out inside the tire as it heated up. Clean up when changing the tire was minimal as it stayed attached to the rubber and not the wheel.
Was it this?