As I have ridden the Voyager back and forth this week I've noticed that I seem to work harder on a bike with multiple freewheeling gears. I say that it "seems" that way because I am comparing my perceived effort to that which I put out on the yellow bike.
Thing is, the yellow bike is not only fixed gear, but I am also running narrower, 700c tires on it. So the extra effort on the Voyager may actually be due to the fatter, heavier tires.
I also notice that, out of a possible 24 gears, I tend to use 3 or 4. That was one of the reasons I went to a single speed in the first place. I noticed that I would go on 50 or 60 mile road rides and never shift.
I shift a few times on the way back and forth on the Voyager simply because I have the option.
(Posted from my new Blackberry Curve)