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As far as I'm concerned, the answer is somewhere between 35 and 50 psi for most vehicle tires and one won't go wrong running at either end of that or anywhere inbetween. Below 35 and r.r. starts to rise; above 50 and the r.r. gains are minimal while the downsides of rough ride and uneven treadwear increase.
However if one runs at 50 psi the tires should be checked for center tread wear and psi lowered accordingly.
If I was airing someone else's tires i.e. Mom, GF, grandparent, etc. I would tighten up that range to 35-40 psi as being the answer to just about all scenarios.
Last edited by Frank Lee; 05-20-2011 at 09:49 PM..
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