You can use a programmer like Smarty or SuperChips to correct the tire error.
Or like my case I used my ScanGauge II to get corrected miles and MPH reading from the ECM/PCM. My truck has stock sized tires (265/75 R16) but I'm still off by 0.5 MPH on the speedometer and odometer. But The ScanGauge II reports the true speed and distance...
Ok Thanks for the information. I checked out the tire size calculator, good stuff. I am currently running 265/75/16, so when I get some bigger tires I'll probably take it to a speed shop or the dealer and get the necessary adjustments. I'm probably over cautious concerning the IP and tuners.
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