I have a set of 305/70r16 PRO COMP mud terrain tires mounted on 16x10 wheels. Just wondering what the best air pressure to run them at, currently have 35psi in each but i think it's a tad high. If i drop down to 30psi would they wear faster, i do quite a bit of highway miles and at 35psi they ride real rough. Thanks - johnny

 

Depends on the load range. Even for a P series tire, 30 would be too low on an F150.
Might want to look at what I have used that works in the past, in this thread.

https://www.f150online.com/forums/sh...d.php?t=233894

 

I've found 40 psi is a good starting point.