I just got new wheels and tires and was wondering what I need to do to adjust for the new tire size. I have 285/35/18 in the back and 265/35/18 in the front. I have the predator, the tuner gives me the option of REV pre minute. I dont know what its set at, but I do know that the exact revs/min of the new tire is 285s, 802 rev/min. 265s, 815 rev/min. Im coming off a stock wheel and tire. 245/45/17. Should I just take the average of the two numbers (808.5) and plug that in? Preciate it.