13401 miles. Viewing them now tells me to replace. I have centramatics installed for 3 sets now. No cupping or howling in corners but very noticeable wear is concentrated on centers more than sides. Looks to be about 1/16 on centers now and sides 1/8 or more. I'm reluctant to run these any more at highway speeds. I remember 8000 mi without centramatics.Dont believe 20,000 mi possible being this is third set. I have a friend that used Dunlap elite and encountered belt separation before wear.