New tire ?
#2
For maximum life and mpg, use the number on the side of the tire when loaded, when unloaded for a softer ride, 10% less. I run 70lbs in the back and 75lbs in the front on my F350 with tires rated to 80lbs. If I load it I will have 80 all the way around. I wouldnt go below 65lbs on an 80lb tire.
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