crockett56

I've found 38psi to be the best ride and wear combo. Cooper at/3 Lt295/70/18, but I don't carry a load most of the time

FDHog

I ran Cooper Zeon LTZ on my 2011. Filled them to 35psi and they ran and wore great. They will be going on my 18 soon.

UncleG

Whatever you adjust them to, do it on a cold morning.

11screw50

That may be true but when you change tire size, the required pressure changes too.

77Ranger460

I have XL p-metrics on one of my trucks. It is used primarily to pull a 6k TT. They have plenty of weight rating for what I do. I had LT tires on it before. I cannot feel any difference in how the truck drives when towing between the two tires.....With the p-metrics I tow with the rears pumped to max sidewall pressure. 5 pounds under max on the fronts feel about right to me.

PaulWil

We are discussing a pickup. The load on the front tires is not the same as the rear.
Find out the weight front and rear at the scales and enter the load vs psi chart and pick your pressure. With a load in the bed expect the weight is higher and the psi should be higher.
Example my 7.3 F350 with oversize "D" tires came out 45+ front with and without heavy load. Rear came out 45psi no load and 60psi at max load.
Tires always wore evenly and had very long live and due having the correct pressure. The ride was pretty good, not stiff and jerky.
Bottom line is the load chart is real

11screw50

If you read the guide, it says to calculate what your current tires are rated to carry and use the pressure that matches that. The OEM tires are good for 2403lb each (but only 2185 when on a truck). The pressure that just exceeds that in the table is 45psi (you can interpolate though which would put you at 44.4psi).

You're right about the other components being rated for less and that is likely because Ford does not want less than 35psi in tires after the Explorer debacle. A 275/60r20 in an P-rated tire only needs 30psi to match the oem rating but an LT in the same size needs 42.4psi to hit that same rating. My favorite is the guys who run 80psi in a LR-E tire or 65psi in an LR-D tire...that's gotta ride like it's on bricks.

tdog02

I run my LT tires at 45 psi. The P metrics (Hankooks) that came on the truck I ran at 40 psi and they wore evenly. If you are riding a heavy load or towing you can bump up to 50 but every day driving then 40-45 will be perfectly alright for a LT tire.

Old Grey Mule

40 psi.

56ecoboost

I settled on 45 up front and 42 in the back, no complaints thus far, will rotate every 8k or so