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Air pressure is based on the load being carried by the tire.
For example....
LT 235/85R-16 E range-
LOAD
2505# = 50psi
2623# = 65psi
2765# = 70psi
2905# = 75psi
3042# = 80psi
In order to arrive at the correct air pressure you should weigh each tire while under load or to simplify weigh the left side front and rear tires under load together and divide the weight by 2
If the front and rear weight is 6000 # total, divided by 2 = 3000 # each tire. The inflation for those 2 tires would be 80 psi.
When weighing, the rig must be attached to the TV and all weight taken off the jacks.
An under inflated tire will roll harder causing more flex which will cause heat build up. Also an under inflated tire will wear faster on both shoulders.
An over inflated tire will absolutely roll easier BUT your tread contact with the road will only be on the center of the tread and will cause the center of the tire to wear faster.
Both over and under inflation will cause premature tire wear. A properly inflated 50,000 mile tire quite possibly wouldn't get over 30,000 miles or even less.
The best tire wear will be at the proper inflation or no more than an additional 5 to 10 #. Never less. It should also go without saying that both alignment and balance are also VERY important factors.
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