I do exactly that yet when I am driving my gps shows I am off my 5mph going under 40mph and off 9mph cruisng at 75mph.
I have been messing with this for a week and tried it on each level and than did not go back to it and still not a thing is happening. I am very happy with the tuner and can not wait until i get my custom tunes!
So how do I make it stick and work for the tire size?
