[slowbro]

Sendler, interesting thread. When I first listened to what you were describing about drafting in another thread, I felt that what you were doing was very dangerous. Now I'm starting to reconsider. I would never, ever do this on an open highway with light traffic because in normal driving conditions that is an unnecessary risk no matter how great the mpg gains might be. However, I very much know what kind of traffic you are describing, and if I were stuck in your commuting situation, I would probably use the same technique.
Rush hour traffic like that is always going to be dangerous and as long as you are alert (like most hypermilers), it sounds like you are one of the safer drivers on your commute.