Great job! I would say that wind was a factor in your MPH. As we all know, wind makes us strong! And tired!

Like you say, 100 miles doesn't sound so far anymore, now it's 125 miles! As you go beyond the miles you've done before, it does seem to break down the mental barriers. I agree, how much time do you want to spend in the saddle?

Look forward to your next adventure. I have a lot of respect for the randonneurs- Doing the kinds of rides you do is so different from the organized rides most of us do. Like you said, doing your homework was a vital part to your success! Lots different from just getting a map and following the arrows and other cyclists!