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When I replaced the original Bridgestones on my Insight with the same tires, they were inflated to 44 PSI (sidewall max).
It took almost 800 miles for the little nubs to wear off the center of the tread, longer than it took for them to wear off the edges.
Remember when you inflate a tire to higher pressures the forces on the sidewalls increase just as much as on the center of the tread.
So far I can find no reason to think the tires will wear any faster than manufacturers recommended pressures. In fact the opposite is true, lower rolling resistance means less heat generation so it should equal longer life.
When my VX went on the road in April, 08 (now sold) the tires were made in March of 1993. I rebuilt the car with 27,492 miles on the odometer (actual). The tires were dated from March of that same year.
I ran them at 39 PSI and drove the car another 15k miles with the original tires that were 15 years old when I got the car. I replaced them when the sidewalls had cracked to the point where I just didn't feel like risking having a blowout at some place where I would not be able to find the proper size to replace them.
The Michelins I put on the car (X model on special at $235 total with warranty) cost me 7 MPG compared to the 15 year old Bridgestones.
regards
Mech
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