What psi should I put in my 285 R17 pro comps for normal highway driving unloaded? The sidewall says "loaded max 65 psi" I've been keeping them at 35 psi. Pro Comp website is no help from what I can find.

 

On the B pillar (Drivers door post) there is a sticker with the tire size and pressure setting for your truck.
It is mostly yellow in color.

 

except thats for the stock tires..

OP, for your pro comps which pro comp tire do you have? I have bfg rugged terrains and they list a max psi of 44. I run them at at 40lbs with nitrogen and everything seems to be normal as far as wear.

 

Thanks BAMA, they're all terrains as listed in my signature. I wonder why max psi would be higher for all terrains.. Maybe rugged terrain is expected to see more off road.

Anyways like I said early max psi is 65 on the side wall and at 35 they look to be sitting right and seem to ride well.

 

One way to help determine the correct pressure for your load is to drive over a wet area on pavement and observe the trail of the tread marks that are left in dry area out the other side.
A even printing of the tread shows a proper pressure range.
A narrow marking indicates over pressured tires and a emphasis on the outer edges shows an under inflation condition.

Side note; What load range are they marked?
http://66.84.240.19/OWB2C_20/Tire/Un...%20Ratings.htm

 

or you can use the chalk method. Cover a section of the tread of the tire with chalk. Drive until the chalk is gone. If any chalk remains, adjust the air pressure to allow that part of the tread to touch the pavement and rub of the chalk. If all chalk is gone, add air pressure to see at what point the chalk remains on the outside edges.

Be careful with a really low air pressure on E rated tires. Stiff sidewalls may give the impression that the air pressure is ok, but it could have a negative affect on handling and braking.

 

This may be a contributor as to why you took such a huge hit in the MPG's. 65psi cold is way over inflated for daily use but I think I would air up to 40psi.

The el cheapo bologna skin Hankooks that came on mine call for 38 psi on the door pillar. I run them right at 38 and she rides great and the wear is consistent across the tire.

 

I have load range C's on mine. Factory Goodyear Wrangler AT/S's. I run them at 40 PSI.

 

They are Load Range D.
Yea Tseekins I bet it has had some effect on mpg. I'll take them to 40 and report back later.
Happy Friday.

 

I run 48psi rear and 50 front on my Nittos. Load range E, they're wearing nicely.