TV tire pressure...

I didn't find anything for this topic using the search function...

I was talking to a friend that runs 10 ply LT tires on his F250, he sets the tire pressure at 70 psi !!! Totally ignores the door sticker.

I have All Terrain tires on the Tundra with a max of 50 psi and typically run 40 rear and 35 front when towing the TM.

What do you guys run? Should I run a higher pressure for a bit better MPG? I hope Wmtire chimes in on this with his expert opinion. Thanks!