Originally Posted by +fireamx
I think you answered you own question. If you changed tires, (even if they are the same exact size) and if they're made by a different manufacture, they can have different dimensions. There is no "standardization" in the tire industry.
I thought you meant that your car was turning 3k rpm's at 80 mph with 100k miles, then at 141k miles it was turning 3,300 rpm's to do the same speed.
Using the same tires.
Dang. Did not know tires could make this much of a difference. Well at 150k I will need to replace them. I will get the premiums I think.