Wideoval redlines-how many miles on them

How many miles are guys getting on their F-70's Wideovals or Polyglas bias tires? I have a set of the BF Goodrich Silvertown bias(7.75-15 redlines) on my Charger and were not happy with the amount of miles I got before the backs wore out. I am not burnout happy either -just a few good ones once and a while!

And to clarify things-I am not interested in radials. I really love the look of bias tires on my Keystones. I drive the car up to a couple of hours to a show on my bias tires now. Any farther I use my car trailer.

thanks

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....

thanks