I have Michelin tires and agree with everything you said about the wear. However, I clearly noticed the edges of the tires wearing while at 38 PSI for the past 9,000 miles (including a tire rotation). Now, at the higher PSI I will assume I can wear the center of the tire more than the edges which might extend its over life ,since its more of a balanced wear. ( I've definitely increased my MPG with the increased PSI. The Cmax is a heavy vehicle...and I love her!)