W2F, what is your averge speed? Does your schedule represent a leisurely pace with the goal to start not too early, keep up a moderate pace, then stop not too late? I know that when I ride stationary bike for workouts, using a hilly profile, I usually can finish 8-9 miles in a 25 minute workout. Just curious if you are really pushing to get through the miles so you can enjoy the destinations, or going a little slower and enjoying the countryside as well?

Also, do you follow the country roads? Which could add significant miles to the "highway" distance.

Anyway, have fun! I envy you.