So how important is it to keep track of cadence on a trip?
After the first few days, about the time we hit the hills in western Virginia, I switched to displaying the cadence and mileage. Part of that was to help make sure I down-shifted enough to keep my cadence up, and save my knees. To be honest, though, the major reason was that watching the speed was depressing. Mileage was useful to help locate the next turn.