8 TO 10K miles depending on how close to the cords my wallet required at the time. As for the BattLax...4K for the 01s, Maybe 6 for the 02s. Metzler z4s (I think) maybe 6K and they wore funny but that may have been due to improper balance (by me) from the start.
If you find any even more durable please let me know.
Good luck ....Hagrid