Oversized Tire Pressures
 

Hello All-

Sorry if you are reading this again, but I probably incorrectly posted in "Drivetrain" instead of "Aftermarket."

Just bought used 04 SCrew FX4 that the dealer installed 325/60R18 Nitto Terra Grapplers on the stock aluminum wheels. The tires really make the truck-I wanted a look a little different than the rest, and this does it (with a billet grille and exhaust too). A couple of questions-

Anyone calculated a proper tire pressure for this set up? I do not tow anything of significant weight. They had them inflated to 35# F&R, which seems low for a 50# max load tire.

Also, its been awhile since I had to calculate for odometer errors. By reading here I see the old way (using math) has been replaced by flashing the computer.

What is the error with this set up at 60MPH? 70MPH?

What is the best way to correct (best and cost effective would be nice!)?

TIA for the help!