I think eating requirements ARE really different from rider to rider. I don't seem to need to eat a lot on a long ride (like, a Luna bar every 1 1/2 to 2 hours; if I eat more, I feel bogged down), whereas my husband will definitely bonk if he doesn't eat quite regularly on the same ride. Just as a matter of interesting fact, we each did bike metabolic tests lately. I can burn primarily fat for quite a while before I start burning carbs more. My husband's fat burning zone is really, really short, which seems to explain why he needs to eat often.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks