I have a 2017 Ford F150 that came with 17" wheels. If I change wheel size what do I do about the mph difference?

 

Tire size changes are done within the BCM.
You can do the task yourself with a free download of FORScan and a purchase of a ‘switchable’ HS/MS CAN ELM327 adapter, generally about 30.00. A windows based laptop is a good platform to run both.. If you go on FORScan, there’s quite a bit of read about making the code/value changes..

 

Thank you for the information. It is exactly what I needed!