Originally Posted by NJspeed69
Hey I'm curious to know, since you'll be running higher RPMs, what are you going to do about the mileage on your car? It's going to get messed up and say you have way more miles than you do. I even noticed this on my old car just from changing the tire size, it added about 2-3% more miles.
Njspeed:
You can also check your proper speed easily with a hand held GPS, they are really close. If you are out some mph, do as HTTP suggests and see the dealer.