| If you do the math you can see that a trip of that distance can easily have a reading difference of 1 or 2 miles with just a difference of 2/10 of an inch in tire diameter. All other things being equal, i would think the difference in tire wear accounts for most of the difference (except for those wheelies she may have been popping!). Play with the numbers yourselves and see what a difference a 10th of an inch makes over 50 miles. |