My last Avons I took off lasted 4,000 miles for the rear. That's my best mileage to date. Put on Diablo Strada's; we'll see. On a side note, the front end wiggle I'd been noticing around 50 MPH upon decelleration, without hands on bars, has disappeared. Gone. Like it was never there. I'm thinking the front Avon (on for two rear tires, about 7,500 miles) was scallopped pretty badly.
Also, the Avon rear needed around 40 grams to balance out. The Diablo less than 21.
I've only scrubbed these in, no serious pushing on them yet. Looking forward to it.