I use 80 in the rear but 65 in the fronts. It takes some of the harshness out of the expansion joints on the highway.
Besides, Ford went thru the trouble to find the right pressure, I use it.
Your front axle and suspension is only designed for so much weight.
It just so happens to be the load carriying capacity of your tires at 65 lbs.
If you weigh the front and need more then 65 lbs, you need to remove weight, not add air.
When I got new tires they filled them all to 80, it's just what they do.