What is the actual increase in MPG from over inflation? Does that save you more than the cost of replacing tires more frequently? I'd wager overinflated the truck doesn't stop as well either. Just my two cents...
To the OP, it depends on weight of the truck really. I'd start at 50 PSI and wee how they appear to be making contact, see how it drives, watch tread wear and contact pattern. More weight means you need more pressure. Running around either over or under inflated will make the truck handle poorly and wear out your tires more quickly.
Last edited by cadunkle; 08-26-2010 at 4:21 PM.
Reason: details...
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