nscrbug: Exactly. It may seem like I'm eating a lot, but then if I don't eat something on my break I start getting hungry on the way back and start to feel lethargic. This is what works for me. I used to just eat one bar and do a 30 mile ride but then I found myself flagging and hungry half-way back. Like anything else, you keep making adjustments until you find what works for you.