I've got a sloppy metabolism that has to be fed -- a lot. From experience I have learned that for me anytime I am touring or if I am doing a long ride (30 miles or more) around home, breakfast needs to be scrambled eggs, sausage, toast, and homefries/potatoes or pancakes. Otherwise sooner or later I bonk.
This past Saturday I was in a morning group ride that rode 30 miles round trip to check out a new diner/restaurant in a nearby town. I ate two slices of toast (homemade oat bran bread that is really filling) and jelly before I went to fuel me till we arrived. I was in the middle of the above breakfast when two guys came into the restaurant who were out for a 70 mile day ride. (They had seen all our bikes out front and decided to stop in.) During our conversation one of them looked at my plate and said, "Isn't that a lot of food to eat on a ride?" I said, "Not for me it isn't."
Like DaveB said, everyone is different when it comes to this when they ride. I never have trouble riding after eating like this because I ate too much. I actually have trouble riding until it digests enough to kick in and fuel me.