What we need is a good GPS tracking program for GPS equipped cell phones. Then for folks to turn on the tracking system while they ride, and upload the paths to a website. Actually, I think what I just described already exists. But google maps needs to get on it. They have public transit paths and walking paths on there, but not bikes yet.
Back on topic, I've noticed with the 3 speed that I can go for days in 2nd gear and still make good progress. Good to know that there's some science and reason to it and not just my perception. I'll have to check out more about how to maintain maximum efficiency.