I worry about losing weight in only three weeks and still remaining strong. From what I read, I don't think you can really lose much in that amount of time--it will be mostly water. Although I don't use it that much, I really appreciate the "granny gear" on big hills. I did a 5 mile straight up hill yesterday and blessed it! It is easier on the knees and legs; if you blow out a knee in the midst of a multiday ride it could be absolutely miserable if not fatal to the rest of the ride.
The bicycle is the most civilized conveyance known to man. Other forms of transport grow daily more nightmarish. Only the bicycle remains pure in heart. ~Iris Murdoch, The Red and the Green