Geez, seriously? Burning a rear TKC-80 in 1500 miles? What are you doing to them? I know I run my tires all the way out just to be cost effective and they are worthless in muck at the end, but... This rear I put BACK ON after it had 6k miles and ran it another 1k before this past weekend where I will now admit it is past useless.
It all about your right wrist. I have had tkc's last from 2500km to 9000km depending on what I was doing with them. I ate an E-09 in 1500km once, but the current one has around 7500km on it, and still a little life left. It has been almost exclusively pavement though.