Please have a look at this article.
Driving Under Pressure (full article) - CleanMPG Forums
100 psi on Crown Vic tires on this Ford pickup:
In years past I ran my tires at max sidewall. They always wore down at the edges of the tread. I now run them at max sidewall + 6-8 lb, which means 50-52 psi. Very even tire wear after 54,000 miles on this set of tires.
Before buying my Civic I drove Volvo 240 wagons for over ten years, about 25,000-30,000 miles a year during the last few years of that period. Mostly highway miles of course but not exclusively by any means. I inflated my tires to 32 and 35 psi which was max sidewall for those tires in those days.
Every time a tire wore out - and they did wear out, driving that many miles - it was always the edges that wore. Plenty tread in the middle, shoulders always worn. But I'd run them at sidewall pressure, which was actually a few psi more than the vehicle placard spec! So what's up?? Worn at the edges supposedly means under-inflation, right?
Exactly. Bought new car (Civic), got it new tires. I've run these tires at about 50-52 psi. since about a week after purchase. Max sidewall is 44. And I'm happy with it. Now I'm not suggesting anyone do that. This set now has 54,000 miles on them. The center tread is only about .001 inch deeper than the edges. So I'd say I've beaten the edge wear issue.
And what's more, I think I can lay to rest the bunkum about over-inflation causing wear at the center of the tread. I'd think that after 54,000 miles at 50+ psi, on tires with a max sidewall rating of 44 psi, the center tread would be gone if there were any truth at all to that concept.
Oh yes, the long running debate about traction and handling etc. I take corners and curves fast enough to scare some of my passengers. The tires haven't let go of the pavement yet. Fortunately my current (very occasional) car pool buddy is a pilot so he's used to feeling some G-force in a turn.