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mgfranz,
I've been using Sumitomo HTR Z IIs & IIIs since I purchased my 1999 Boxster in 2009.
HTR Z IIIs are 300 AA A for tread wear, traction & temp.
Right now I have HTR Z IIs. They are 360 A A.
It doesn't rain much here in Central Texas so a 360 rating for tread wear seems pretty good to me.
My car has well over 216800 miles, and I put the last 112000 miles on since Sep 2009.
I tend to get about 16000 miles out of the rear tires and around twice that with the front tires.
I purchase thru TireRack and I cannot beat the price.
I am no expert and I do not track my car, but I have been very pleased with HTR Zs.
MNC-I
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