Big fan of a good ol' peanut butter sandwich, nice and thickly spread- good for longer rides or a hefty run (3-hours beforehand). For the morning commute (7 miles) I usually have nothing since I'll eat brekkie at work, knock back a Berocca most mornings, but that's not fuel per se.
Must say, one time I was out on the Saturday night for a mate's Birthday. Had a load of beers, curry, 2 rounds Irish coffee, fell asleep on my mate's sofa, woke up, realised I was due for a cycle with a mate round Richmond Park in an hour, train to Balham, cycle shorts on and blitzed it to the park. All in all I did 40miles that day and the legs loved it. As for the hangover...