Quote:
Originally Posted by hatzie
Your tire size choice will affect mileage more than you might think even if you've matched your speedometer drive and driven gears to the tires and axle ratio. 1" diameter difference can change the effective axle ratio by around .10
If you don't match the speedometer gears in the transfer case to the tires and axle ratio the speed and odometer reading will be off.
Play with the numbers a little in my RPM axle ratio tire size spreadsheet. It's quite enlightening.
http://www.mediafire.com/download/zk...ansferCase.zip |
I've run into that issue trying to calculate mpg in my other truck, however the blazer's speedometer is surprisingly accurate according to my phone's gps.