On my past AVONs I've gotten 14-17,000 miles on the rear w/ 42psi & 18-20,000 miles front w/ 40psi as AVON suggest. Don't know about the one's on the B, showing very little wear @ 4,500 miles. I always keep a very close eye on my tire pressure, for safety & mileage reasons. I usually get new tires as soon as it gets close to the wear bars. Don't trust tread that close during a FL rain storm.
We had a guy in our group, that had a chicken stripe all the way around his rear tire. Too cheap to buy a new tire. We make him ride in the back as no one wanted him to crash in front of them. He stopped riding with us for a while. He then showed up with a new el cheapo rear tire.