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Discussion Starter #1
This weekend I added the XRT PRO after doing a CAT/DPF delete. Only running the mild tune (+60hp). Everything is working great except for one thing, the speedometer is reading 6mph high @ 60mph.

The manual shows a selection for tire size calibration, but when I check the tuner this selection is not available.

What am I doing wrong? Is there a problem with the tuner software build?

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