Quote:
Originally Posted by Fat Charlie
It makes sense: the more you deviate, the more slop there is to correct for. Do the best math that you can going forward, and next time you have a long trip, stop at a mile marker, zero out an odometer, fire up the GPS and go as far as you can to get the longest sample you can.
Then stay with that math until you change hardware again.  |
Having change the wheel tire combination from 185/65-R14 to 175/70-R13, I neededto re-calculate my odometer calibration. With GPS, on a 112 mile ride today, I calculated a 2.9% undercount on the OEM odometer. 112.54 miles (GPS) ÷ 109.3 (OEM odometer) = 1.02964. I'm gonna be slihtly conservative again and go with 2.9%.
I do not understand why this undercount persists. I expected these tires/wheels to yield an even count or and overcount. But there it is... that's what the instruments show.