I finally had the time to reprogram my 2004 F150 lariat 5.4 supercrew. Problem I notice is that the speedometer is inaccurate. It is going faster than the actual speed (difference of about 10-15 mph) verified through Pioneer Avic N2 GPS. Programmed under performance 91 Octane, accepted all default values except for the tire size (22 inch rims approx. 31.25") no towing...
Can someone please help me to resolve this issue? Any help is greatly appreciated.

 

This thread might help you out ~ it discusses revs per mile spec, etc, and how to calculate it

https://www.f150online.com/forums/sh...ting+tire+size

 

Also, remember that the best way to handle getting something resolved in those types of tuners is to follow the instruction manual that came with it and call the manufacturer directly at the number listed in there - it's listed in 3 different locations in that manual, telling you to call them if you need any help - give them a call & they'll be happy to get you taken care of!