Help with tire psi

[gago1101]

I got 33x12.5/17 flaken wildpeaks. My milage has dropped to around 14-15 mpg highway. I was thinkign to increase the psi to decrease the rolling resistance. I currently have them at 37 psi cold. THe tire is rated D/ 50 psi at 2600 lbs

How high can you go on the psi before getting uneven wear? Would appreciate some input

 

[Alex T4R]

There is a chalk method. Try to search it.
Basically you draw the line across the tire and drive on the straight road, if it rubs off on the inside it is either to much or not enough psi and the same thing if it is rubs off on the outside. I just don't remember which one is which. I'm sure if you search it even here you will find it. I have 33.1" tires and I ride them at 40psi, seems good and my mileage only drop 1 mile per gallon then it was before.

 

[Biggcrisp]

Input - no facts

45 psi should be fine. If your vehihcle was in my work fleet.....they would be ran @50 psi.

Tires cost say around $ 1000 per cycle
Fuel cost say around $ 10,000 per tire cycle