What do you eat on the bike?

On ride that's more than a century long, I snacked/drink every 20 miles as the longer the miles, the more you start to feel the effect of certain food in your body affect your energy levels.

maybe if you didn't leave it more than an hour and 15 between eating/drinking something you wouldn't feel the effects of low energy levels. unless of course you are averaging 30mph+ and are eating every half hour or so.