Inflaton pressure is equal on the inside of the tread area and the sidewalls of the tire.
Since there are two sidewalls for each tread area the increased pressure should not really affect the tread wear. That has been my observation over 50,000 miles on my VX and Insight.
When I put the new OEM tires on the Insight I monitored how long it took the nibs to wear off the tread area, and I do not drive around corners slowly.
It was 1000 miles before the nibs were worn off the center of the tread, and I was averaging close to 70 MPG in the Insight, and it was a automatic (CVT).
I will probably never run manufacturers recommended pressures in any car I own again.
I'll bet the Michelins on my VX will last 100,000 miles at 44 PSI and the 10% increase in mileage will easily pay for the $225 total the tires cost me, and I can still go close to 60 MPH on an average Interstate cloverleaf.
My 59 Corvette would do 70
, manual steering and 4 wheel manual brakes.
regards
Mech