All good points Gonzo, I will agree that one specific pressure is not the rule depending on the tire and driving surface.

I run Michelin LTX/2's on my Pick-up (It a Chevy , and that's a story for another day) and I can't tell the diff. from 36 to 40 but I run them at 36 , I don't feel 36 is under-inflated for that specific tire weather it be on a full size truck or an SUV for everyday street driving.

I got 70k plus on my last set of Michelin LTX's and ran them @ 36 with no under inflation wear issues visible on the tire, of course I rotated them every 7500 and rotated and balanced every 15k and checked the pressures every other week.

So i guess to sum things up , figure out a pressure that works for your style of driving and conditions .