Originally Posted by 99offroadrngr
did you work in the percent of tire height decrease into your mpg calculation? If not, you should because your speedometer and odometer aren't going to be as accurate as they were with stock tires.
Your speedometer and everything will be off with a different size.
With your new tires, which are about an inch and a half shorter, needs about 45 more revs per mile than the others.
Also, with the smaller tires, your Speedo will read 60 when you're actually doing a little over 56.