The collegiate cycling season wraps up soon so either next week or in two weeks the Flyers will be out at AHS for their Saturday group ride at 7:30am . This would be an excellent ride for you. Average speed is usually around 19 and 22 mph for 60 - 80 miles. I would guess that you are already faster than some of the team members.
I don't know if djbrod has mentioned it or not but he and I are riding at Pine Mtn on Mondays with another guy. It's about an hour drive from Auburn, but it's the best climbing around here. PM me if you want to try to meet up with us.