Trying to balance load handling with ride quality, so I called michelin and with MY tire and MY F-250 this is what they said - YRMV
PSI Load
55 2850
60 3030
65 3195
70 3375
75 3540
80 3750

obviously will err on the side of more than enough, but why ride on rocks unless you have to

so instead of blindly putting 80 psi all around to go to max rating, I could run 55 front and 70 rear and be very safe with tire loads for my gcwr and 5er !!! - cool !

 

I have the same tires and the door sticker says 65 psi front and back. Not sure where you got the 80psi from. It may be on the tire but that's not vehicle specific.

 

My 2011 350 says 65/80

 

80 psi i sthe pressure at which it will handle the 3750 per tire l
the tire placard on the truck tells u what ford suggest aas an unloaded air pressure

i found with my heavy pin wgt that it was a lil too soft and squirmed a bit
so went up to 75 and it was much better ride

AND maybe just a coincedence but my mpg went up after !

 

Very interesting nice thread!