Not sure what to expect out of the new 023's mileage wise, but I won't be waiting to find out. IMHO these are the worst tires I have ever ridden on, I think polished teflon would have more grip in the rain.
I have 2k miles on my 023's and next week they are coming off for a set of PR2's
Many people don't realize how bad the Bridgestones are until they put a different set of tires on the bike...
Just my 0.02