67k is crazy, I get 16 - 20 on my 10 ply, thats with a commercial rated tire which has 3ply sidewall.
truth...still got em on there....theyre down to the wear bar now
but no cords or slick spots on 'em @ all.
i probably should have pulled 'em around 62k but ive had a couple
of INTERSTATE runs (asheville nc to get a car & omaha ne to get
a motorcycle).
theyre the longest wearing tire ive EVER owned...E rated or otherwise !