I went out for a ride on the trail today, and since I was feeling good, I went hard, and checked my time at 15 miles: 16.7 mph average.
That's the fastest I've gone in a long time. I kept riding fast, but then I saw some friends, and turned to ride more with them, chatting and relaxing. It was even more fun. (That probably says a lot about my biking attitude. I was happy to turn around and ride a bit with friends chatting rather than pushing to do a time thing.)
Here's some perspective: from May 2007, I rode just under 16 mph.
From October 2008, 17 mph.
And from July 2009, 17.4 mph.
For me, then, this was a really good ride. I think the bike fit helped. Certainly, it's even more fun to ride with feet that aren't numb.
I've done just under 400 miles this month (compared to about 450 all of last year), and almost 800 miles so far this year (my goal is 2000). I'm on a good track to finish my fourth week of 100 miles/week, and I'm really happy about that.