Originally Posted by optikal illushun
good call, i thought it was for up to 31 (rounding up) as well.
sarahs gettin 285/75/16s on soon so hers will be off by about 8-10% and read 5 mph faster...
so how i add that into the milage? so i can keep track for gas milage...
If you are changing from 245/75R16 to 285/75R16, your speedometer and odometer will read 7.8% low or 92.2% of what it did before. [This assumes that you will not be changing the axle ratio which also influences the speedometer reading on 2001-up (and 97-back)].
The speedometer will read about 7.8% slower
than actual meaning that the truck will be traveling at about 65 when the speedo says 60.
To correct the odometer reading, multiply the indicated odometer miles by 1.084 to get actual miles.
1/0.922 = 1.084