I've been doing a fruit smoothie before a morning ride (1 banana, a handful of strawberries and a handful of blueberries, soymilk) and that keeps me going about 25 miles, after that I am trying out what snacks work well on the bike. Dried fruit seems to work ok, a powerbar is too heavy.

If I have bread or oatmeal it seems too heavy and I feel sluggish for the first 10 miles. Can't have coffee (wow that kills performance worse than a bottle of wine the night before!) or dairy the day before (I don't seem to be able to go as far if I've had cheese).