Thanks elhgih, will do!
Quote:
Originally Posted by oldtamiyaphile
You assume that the speedo and odo are calibrated the same, they're not on any vehicle I own.
Your odometer was accurate from the factory to about 1%, it probably now under reads by ~10%.
When you put 31's on a standard Jeep XJ/TJ, you end up with an accurate speedo (about 1% over reading), but the odo now under reads by around 10%.
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Like I have shown, my theoretical speed (speedo x 1.12) was equal to my ACTUAL speed in a one-mile time test, to within 1%. Your speedo might have been 5% over, mine is apparently less.
As far as the odometer output I'll have to test that separately over a longer stretch of interstate, but for now I simply calculated my MPG as miles * 1.12 / gallons. No calculation like this is going to be perfect, but the variance between the speedometer and odometer is likely negligible, if the odometer was indeed factory accurate within 1%, and the speedo*1.12 at this time is accurate within 1%.