Well, I averaged 25 miles/week in June. My main issue is time; I don't want to ride too much past 9:30 PM or so, and many days, I don't get home from work until 7:30 or 8. The main reason I want to get faster is so I can ride more miles in less time.

I've recently learned that a half cup of coffee before riding increases my speed a bit. I'm a little uncomfortable with this knowledge; my discomfort does not stop me from using what I've learned.