Perhaps it's just me, but I found riding very long distance on carbon more exhausting somehow than high quality steel. I sold my carbon bike in favour of a pristine triple butted Miyata 1000 that works better for me at least for long days in the saddle. Don't know why, maybe it's the "planing" or slight spring in the frame, or the way it absorbs shock, I really don't know why, but it's real.