Well, you can certainly check to see if the custom tune was uploaded. Look at the display screen and in the upper right corner if you see 1, 2, or 3 there, you have a tune loaded. If you see zero "0", you're at stock.
You can also tell if your tunes are indeed the custom tunes: Go to the main menu on the programmer, select [Diagnostics] -> [Tech Support] -> [Version Info]. In the calibration version, it should read "0.0.xxxx" where the x's are [usually] the same as your serial number. If so, then you have the custom tuned files. If the calibration does not start with "0.0." then the unit has canned tunes, not custom ones.
If you are using custom tunes and you gave Bill the information on tire size, then it becomes a part of your tune and your speed will be correct, as long as you DID NOT open the Custom Options Menu! If you opened that menu, and even if you did not change anything, your Tire Size and possibly Gear Ratio are likely BOTH wrong! You will have to retune and fix them.
Beyond these points, I have no further suggestions. With the bigger tires, do you also have a lift? Both mods will tend to hurt your mileage and you probably cannot get it all back.
- Jack
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