245/75/16 stock hankook dynapro ht psi?

2016 access cab 4x4

I know the door and manual says 32 psi all around, which seems low to me (I know the dealer/mfg. runs them low for a smoother ride for the customer). Simply looking at the tires, they look a little low based on the sidewall bulge. Tires are rated for 51 psi max cold pressure.

Has anyone chalk tested or ran them higher than 32 psi with good/better results? I mainly drive lots of highway, looking to squeeze more mpg out of them safely with good wear.

I searched for this topic on the forum, but it was mostly for aftermarket sizes like 33s-35s and off road treads. I am just looking for input from 3rd gen members with my exact truck.

Thank you!