I have a 99.9/.1 (pass/passed) ratio. I have had a guy pass me while I was cursing along at 24 mph. But then passed him after running him down at 29 mph.

he was not happy at all that I passed him and let me know at the next stop light. So when the light changed I felt him behind...
Other then that one morning I was riding along at 26 mph and had two bike racers keeping up with me for 6 miles and then pass me as I stoped to look off the 3 mile bridge. I stoped to see some Bat Rays playing in the Bay.
Most of the time I try to make a 2.5 min mile. Which is 24 mph cursing speed. I can and have made the 3.5 mile work commute in 9.5 mins. That gives me a average ride speed of 22 mph.