I have a hard time eating while riding. But for rides over 40-50 miles I look at it as just something that has to be done. I don't eat too much if I know it's going to be done soon and I can gorge when the ride is over. For a 50-or-so mile ride I'll have a fig newton package (the 2-pack double-wide thingys, equivalent to about 4 standard size ones) and maybe a Clif bar + 1 or 2 20 oz. <whatever>-ades + a bunch of water. Never got into Gels much. Organized centuries I eat as much as I can stand at the stops, which usually isn't much, but I know I have to shovel something in for fuel. Haven't done any solo centuries yet but I imagine I'd just double or triple up on what I mentioned above, maybe toss in some salty pretzels or Goldfish or something like that because I get tired of all the sticky sweet crap after a while.