Re: MSD question
Ok, time for the long answer
Yes, I know the odometer is off also. i figure its off 11.9%. I had 215 75 R15's and i went to 31's. the i used 27.7" as the nominal diameter of the 215's. the circumfrences are 87.0" and 97.4". I took the difference in the two and divided it by the origonal size. Even after i calculate in new tire size differnce, i'm still down almost 2mpg. it might not seem much, but i didn't have that great of mileage before. this puts my average around 15. i'm not happy with this and was looking for any improvement.
Will a MSD help, and if so, how much?