Interesting, evolution! Your experience is counter to that of a number of people around here and/or on cleanmpg. In general, running pressures at (or in some cases in excess of!) the max rated pressure for the tire led to longer life over similar driving conditions than driving at the "placard pressures" recommended by the car manufacturers.
And few people there have experienced the center-tread wear from high pressures.
I did to a small extent on my previous tires, but not much of it.
I guess that goes to show that there are no universal rules...
-soD
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