Hi Joe,

I drive Polys since 20 years on several 1970 B-Bodys.
It is important that they are new.
They are excellent the first 5-6 years when new. Very soft, great grip, too.
After 5-6 years you can slightly start to notice that they get harder. After 10 years they are hard and not nice to ride in rain anymore.

I have driven several sets from new to thrown away after 15 years.
In total I drive my cars usually 10-15.000 Kilometers within a year on Polys.

Front tires can last up to 20.000 Kilometers if the front end isn't worn out or missaligned. Rear tires hold depending on your right foot.

Carsten