my fronts are usually set to around 35 - 40 psi and...they are starting to cup at the sides. the rears are also at the same psi and they are fine. the owner before me said with anything over 55psi would cost me a visit to the dentist! i believe him; i pumped in 55 and then 60 and the truck was all over the road! thought i was a dui suspect! never again will i go that hi

 

empty these guys will mpg very well! With just a 440 in the box I got 22.5mpg going mostly 75mph from my folks' up to Minneapolis and back. That was on summer fuel with standyne. At 65mph I would have hoped for close to 25mpg. At 75mph my truck feels a slight bit 'pushed', so I think it'd do quite a bit better mpg at 65.

 

I keep the tires (front and back) inflated at 75 psi and on my last set of Michelins I had over 100,000 km with equal tread wear.

 

Ive got the same tires i believe and i run 60 in the front and 50 in the rear. ive toyed with the pressures a little and ive found that i usually cant find a difference, ive ran the tires for over 25,000 miles like this, and they havent shown any signs of cupping.