One Gear - Jeff Galloways beginner plan includes one 26 - so your thinking is in line with at least one published schedule! and the target based plans includes a 30 miler for those so inclined. Galloway is keen on walk breaks on long runs, so with one gear (and I remember your gearing being high) you might want to miss those bits!
Galloways reasoning for walk breaks is that it speeds recovery as Coughie was finding. I've not tried that before. More food for thought.
I have 2 types of long run. The one where I go out and run slow for a long time hopefully training for more efficient fat burning, and a long run that gets progressively faster, incorporating some marthon pace work. I never do the later type of run over 20 miles (too knackering and longer recovery). But the slow run, I will happily go out for longer than my estimated race time. For the slow run, I eat nothing, for the faster run its more a simulation of racing for short periods, and may have a gel or two
Edited: 10/12/2012 at 23:06