My commutes are 15 miles round trip, on generally flat roads, and I average about 13 mph for them (that accounts for a lot of stop-and-go riding and weaving around the downtown areas).

My group rides are on "rolling" terrain, generally 30-40 miles, at anywhere from 17-18 mph average. I'll gain anywhere from 1800 to 2500 feet for those rides, usually.

I just hit a personal best on a FLAT century - 97 miles at 20.6 mph.

According to my Bike Journal account, my "average" ride (total miles / number of rides) is 23.2 miles at 15.1 mph, and I've gained a little over 1,000 feet each ride. I'd say that's a pretty fair assessment of my year. FWIW, my average HR was 142 and max HR was 189!

Oh, and I've been riding, more or less, for about 15 years now.