I would love to ride with you. I live in Concord and my average is around the same as yours. I have lots of fun rides I do (and lead for AMC) around Concord, Carlisle Acton, Boxborough, and points west.
I ride to Bedford almost every Monday afternoon to go to the Farmer's Market during the summer, although today it looks like bad air and thunderstorms might keep me in the car.
Let me know!