No you can adjust the tire size through the custom options menu when ever you reprogram. Try entering 2750 as your tire size and see how close that gets you.
Or the best thing to do is to program a value you know is incorrect like 2600. Then if you have a GPS going clear both it and your odometer and drive at least 15 miles. Then do this little formula:
GPS odometer/truck odometer x the tire size you just entered (2600). The number you get is your actual tire size.
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