I chose this category (long distance) because the farther the ride, the more weight becomes an issue.
I have a very long ride coming up in June (either 800 or 1600 miles depending if I ride back home or have my family pick me up in the SUV) and the other day some friends of mine and myself were weighing bikes on a pro bike scale. My old (1969) Raleigh Competition GS (all Campy/friction) weighed in at 24.5 lbs. One of Greg LeMonds championship 1970's Raleighs(12 spd) weighed in at 19.3 lbs. (amazingly light for a 38 year old bike!).
My friend's all carbon $6500 Pinirello (fully equiped, bottle cages, pedals, 20 speed, etc.) weighed 17.3 lbs. and here's the reason for this post.....my "touring" bike, a Motobecan Le Champion (aluminim w/carbon fork, 30 speed Ultegra, heavy touring seat, cages, computer, pedals, Vittoria Rubino Pro 25c tires) WEIGHED IN AT 20.3 POUNDS!
I realize I'm not including frame sizes but I have less than $2500 in my bike and it's only 3 pounds heavier than the carbon guys!
Oh, one more bike I forgot to mention....a Raleigh Sojourn I think? Full on touring bike with steel chainrings and 32c tires weighed 29 pounds.
I'm not selling a point of view here, just sharing what I think is interesting data, I went crazy with the scale!
I do have one opinion. however, a 20 pound bicycle is a light bike, a 30 pound one is not. After a few back to back centuries, it starts making a heck of a difference. If you are a 40-50 mile a day rider, I suppose that difference isn't as big a deal.
All this assumes addl cargo weight is equal across the above bicycles. Raydog