This May I went on a ride that was billed as a no drop, "recovery ride". I had a hard time keeping up and at one point slowed down and dropped to the back. The wife of the ride leader was riding in the back and asked me if I could gear up (i.e., pick up the pace). I asked her to drop me but she wouldn't. 30 minutes into the ride, my computer said we had gone 11.2 miles which is more than 22 mph.
WOW... your "No Drop" rides are a bit more "rutheless" (? spelling), than ours!

Ours are seriously slower... and we have 2 stops in 30-40 mile rides. The average is around 12-14 MPH. So, I am lucky to have that.

But more and more, I find myself riding alone... because I am too slow to go with the really fast ones, but too fast to hang with the slower pack.