20,000 miles? I have 35" early Kumhos on my d/d /work truck/weekend warrior Toyota p/u (with a rear locker) with over 30,000 miles on them and I still have 85-90% tread left! I rotate mine, religiously every 5,000 miles and have a fifth as a spare that gets rotated in also......they've held better than any tire I've owned (you name it and I've probably had them) and they've been suprisingly capable offroad as well--------Hans