That's interesting. I generally don't ride for at least 3 hours after eating and I find that I still have enough in the tank unless I'm climbing a lot of hills. I generally don't eat or I eat very little while riding (usually a granola bar or something in the 200 calorie range) every hour and I find that I'm not hungry at all when I'm done. I actually tend to eat less through the day on the days when I'm riding.

Am I fitter ? Yes.
Has my avg. HR gone down with time? Yes.
Have I taken off any more weight even though I'm eating less ? Nope. Those last 10 pounds are going to be stubborn ones. I think I should have a jersey made up that says:

"By all means carry a spare when you ride and I don't mean the one around your middle."