On my longest tour so far, I averaged 100 miles a day; that included days of over 150 miles and days of under 50 miles. I was 21 at the time, didn't have enough time, and I went as fast as I could. I don't regret my decisions, but I wish I'd been able to take more time, and I wish I'd done a shorter distance --my goal was to get across the country, and I didn't succeed at that. Should have had more fun doing a shorter distance.

But ironically my average daily distance hasn't dropped off all that much on more recent tours, often taking on 80 or 90 mile days. I know why I do this to myself: I try to do a long tour in a short time. It's a mistake, but one I make every time. That's why I've started doing more randonneuring lately, and less touring.