You're getting some great advice it seems to me. I'm almost 60, out of shape, and have never ridden long distances. 400 miles is my comfort zone on my other bikes. 500 pushed. I'm thinking 600-700 should be fairly easy on the F6B and it's amazing enough that I've thought of doing the reverse of your trip -- Fort Collins - Memphis as an iron butt ride just to say I've done one.