Originally Posted by Emthusiast
My tires are properly inflated. I'm not sure if they were around 70k (the 3k rpm data). They may have been over inflated. I did change tires too around 110k. They were a different make. May be the radius of the new tires (non premium - low speed rating) is less than the old ones (premium tires - high speed rating).
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.