Whether you are a coffee drinker or not, those gels with the caffeine in them might help! I'm thinking specifically Clif Shots.

Also, think more about the types of food related to the time on the bike. Fats and proteins first, simple carbs later. So maybe eggs and meat for breakfast (or if you're vegan like me, tofu and veggie sausage), and then once you're riding stick to simple, quick digesting carbs as needed.

BTW, my advice only comes from what I've gathered through all my obsessive reading...