Well, I have finally reached a milestone. It now takes me about as much time to drive to work by myself (1:20:00) as it does to bike to work (1:24:28)*. 15.3 mph average isn't much by most standards, but I'll take it. Go me!
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* Since Ellen and I work just a few miles apart, we normally use the HOV lanes, which cuts the commute time in half.