Mike67RS

Without sounding like to much of a nerd, I calculated the difference in revolutions per mile between 265's and 315's at about 8 percent. So at 70 MPH it should be an actual 75.6 MPH. I use the same formula to calculate MPG. Mike

tobyw

I was similarly nerdish ;D, but I measured the static height difference of mine and then applied that percentage to my mileage calculations. By the measurements, mine is off 9.4%, and this was also verified by my GPS.

BamBam

By tracking with the GPS I notice about a 10% difference.

Jeff K

Agreed, it is very close to 10%. I used a GPS as well.

Drafter

I don't have them on my truck but my buddy put em on his truck and they DO rub at full lock. I watched him when he pulled into a parking spot and the rub was visible and could be heard. His truck is identical to mine except long bed and 6 spd.