Ladies, I here you on that one. I always find myself riding alone on group rides. Becuse I can only hang on to the fast group for about 10 miles after that I have to slow down, they average 20-22mph. Then the slow groups are below 15 some down to 12. So I never see them again. So I just keep trying to get faster and hang on longer. I average around 18+. Road Raven is right though it should be easier to hang on when you are in somebodies draft and another person behind you pushing you.