Quote:
Originally posted by Beastmaster:
For those of you who are running the Adventure package or are running 33's, please adjust by increasing your total mileage by 3.7%.
So, if you're ran 100 miles on the odometer, you've actually run 103.7 miles.
The 3.7 percent can make a difference in regards to your overall MPG. For example (in a perfect mathematical world using 11 gallons of fuel exactly):
Running 32's (base/lux)
200 Miles run
11 Gallons used
200/11 = 18.18 MPG
Running 33's (Adventure)
200 Miles run (on odometer)
207.4 miles actual (3.7% difference)
11 Gallons used
207.4/11 = 18.854 MPG
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Why? There are different calibrations for the off-road and the regular package. I have to assume GM has a different odo calibration in each one. So, if the vehicle came from the factory with the larger tires, the odo SHOULD be correct, those who installed larger tires will have an innacurate speedo. Even with that, your calculations will not be accurate for all H3s.
My speedometer is off by under two miles at 70 mph, calculated on two separate GPS units, on two different trips, and I even did the mile marker versus the stop watch a few times on flat ground in IN.
I'm probably getting a little less in mileage than I stated earlier, but it would be about .4 per mile.
Since those trips, I have uploaded two different calibrations but have not rechecked the miles on the speedo versus the GPS units. Hopefully, one of those calibrations corrected this error.
(NOTE: Federal Law allows a 5$ plus or minus on speedos.