N-Rated tyres yes or no
#31
Irrespective of the amount of testing they might do. I find most of the tires on their list to be poor performers. I have used several of them on my Porsche's and do not feel comfortable on most of them. I have also used a number of tires not on their list that IMO are superior in every aspect to some of those on their list.
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#32
Treadwear. Porsche is about performance not treadwear. I'd worry about treadwear if I owned a Honda Civic not a Porsche.