As for Polyglas, I know several guys that have 20K out of their tires. I also have guys that have gotten 7 years out of running them at the drag strip. I also know guys that get less than those numbers, but for the most part....

Snarl softly and carry a BIG stick 1969 Hurst/Olds Pure Stock 13.23@ 103.1 and the a/c blows cold! Rusty Small