Have you driven the truck a bit since airing up so the sensors relay PSI data? If yes, you may want to retrain the sensors (your owner's manual should explain the retrain procedure).

 

I run my tires low for proper wear since I spend a lot of time unloaded. The door jamb is a guideline, go to the tire manufacturer and you'll get a better idea of how much pressure the tires should have for a given load. Running in the 60+ psi range unloaded, I just wear down the centers of the tires, it's too much pressure for an unloaded truck.

 

65 in the front, 55 in the rear.

I'm running the NItto Tera Grappler G2's in 35x12.5. I looked at the inflation guide and can run my rears as low as 45 for the load I carry with my toy hauler. I have been experimenting with 55, 50, 45 and making sure empty the tires are wearing flat. I'm doing the old shoe polish trick or using the light dust that gathers on the flat driveway at my vacation home to see how the tires are rolling on the ground.

 

I'm just going by personal experience. Several Fords we've owned showed wear on the outer edges when we used the door jamb pressures. Both of my Excursions weighed about the same as my F250, and I got great tire wear keeping their tires at 72 PSI. My old '87 F350 crew-cab SRW weighed only about 5K pounds and I got 96K miles from a set of tires kept at 75 PSI.

 

You can use this Toyo Tire Load and Inflation Table, but I always use the method below.

Weigh my axles
Multiply the maximum tire load by 2
Divide the actual axle weight by that ^^^ doubled maximum tire load
Multiply the quotient ^^^ by the maximum tire pressure

Example
5000 front
3000 rear
80 psi tires rated at 3750lbs

3750 x 2 = 7500
5000/7500 = .67
.67 x 80psi = 53.6psi front
3000/7500 = .4
.4 x 80psi = 32psi rear

I'd probably go 55psi front and 35 psi rear unloaded like that. Hauling a decently heavy trailer I usually just air the rears all the way up and leave the fronts. I might put a little more air in the fronts for a long tow or something actually heavy.

I've never had issues of the tread not wearing flat using ^^^ this method. And bonus when I check the chart it always shows that I have over inflated by some degree, so I figure it as an extra safety margin.

YMMV

 

Let me help your out.

Your truck should have a sticker in the door jamb and it gives the max payload and the psi. NOTE!!! the psi given is the psi for the payload weight. Note on my payload/psi sticker what mine is and what I actually run unloaded is 70 psi all the way around.

Every tire mfg has a chart like the one shown for their tire and its psi based upon the payload.

After all this which you need to take note of is the CONTACT PATCH. That overrules every thing because its where the rubber meets the road. Take note the outer edges of my tires were not touching pavement unloaded so I reduced the psi to 70 psi.



Hope this help you out...




This my payload/psi sticker and my psi/weight chart for my tires.

 

Stock. I run max pressure when hauling the really heavy truck camper. The rest of the time, I let the leaky valve stems lower them and when the TPMS alarm goes off, top them up again. Or top them up again when going camping. I think it's 65 rears and 75 front, per the door jamb.

 

It corrected itself after I drove it. THank you.
Another stupid question; should I be concerned if my tire pressure rises above 80 PSI when towing on hot days? Air down a bit maybe?
I'm running 77 in rear now, (DRW) and 70 in the front for a long trip.

 

If you don't know, then it's not a stupid question.
Tire PSI is assumed to be set when the tire is cold. Tire manufacturers take into account that pressure will increase with a rise in temperature and load. So no ... it's of no consequence for them to exceed 80 PSI (if that's the maximum listed on your sidewalls) when towing on hot days.

 

2022 F-350 SCLB Lariat 6.7L Removed 18" and installed factory pull off 275/65R20 10-ply Michellin All Season. Set front at 68 and rear at 80 when towing 31' toy hauler RV or fully loaded bed of dirt or rock. Set at 60 all around unloaded for empty highway long trips.

 

There was already a current tire pressure thread going... another thread risen from the dead here.

 

Truck is completely stock running the 275/65 18RE Continentals that came on it. At first I thought the truck rode a little harsh, so I came down 5 pounds off the sticker all the way around and that seemed to help. Then gas went through the roof, so trying to get every drop of MPG I can out of this beast I pumped the tires up 65 front, 75 rear.

I then found it still seemed to ride pretty well, for a Super Duty truck with a 3400# payload. I guess the tire sidewalls just needed to break in a little. 4500 miles now over 7 months of ownership.

 

5 over cold psi

 

I scale the truck and do the math based on the the tires capacity. This is used to determine the minimums.

 

Carli 3.5"
37x12.5-18 Toyo AT 3
45/40