Yes, I agree that is a very good pace. I did my first ride on my own today (not on a tandem or along side my husband). I went 20 miles and averaged 11.7. I don't know what the elevation was, but there was definite elevation. Lucky for me, I feel pretty decent on the downhills. I got up 25 mph a few times, which is about as fast as I feel comfortable right now. DH and I have gone 45 on the tandem and I don't know if I'd EVER feel comfortable doing that on my own!

I don't plan on doing any major group rides on my single any time in the near future. I certainly don't want to be the one holding everyone back! I did a 10 mile "easy" group ride with some friends yesterday and was still the one bringing up the rear. Good thing I have the tandem with a superstar cycling husband to keep me in the front and looking good! If I felt I could do 14 mph average for 20 miles, I might feel okay about doing a group ride. So, good for you!!!