IDK, what does it say? Lower will get as more soft ride and a high tread wear and less MPG

 

As a rule I run about 80% of the max PSI that is written on the side of the tire.

 

305/50/20 40+/- in the front, 35+/- in the back, at the track 32 in the back gives the best traction/launches

 

I run 55 psi in my terra grapplers with E rating. max is 80.

I think following the door jam is stupid because what if a guy puts a D rated tire on his 3500 that calls for 70 psi but the tires max is 45 psi. I can see if the truck was stock but I always follow the actual tires measurement.

 

True, I worked in a tire shop for a couple years after school and I never used to go by the door stickers.. always what the tires recommend..

Im running 44psi in my 315/70/r17 just normally, when im 4x4ing I go down to 15 - 20 psi depending on what im doing with the truck..

 

Pro-comp Xtreme At 305/65/17 (claim to be 32.6 but actually 32 even)
Recommended PSI is 50, You don't want them to sag) Really smooth ride.
I lowered them to 45 in winter as these tires are brutal on ice when your running more torque the normal joe. (gotta keep revs in overdrive under 2 Thow RPM too).

 

about 40 psi

 

Sorry to hijack but where abouts are you in BC canadian wheeler?

 

Factory 275/60R20s, I run 37 typically. Too many bumps around here for the wife. For highway, I sometimes bump it up to 40. All four corners are the same.

 

4x2 QC running 42psi cold on 305/45/22 all the way around.