The one century I did, I did have pizza the night before. I ate an early dinner, then got up and had my regular bigger breakfast I would eat before a long ride, 2 scrambled eggs, whole wheat toast, fruit. I brought all of my own food, since I can't eat PB. I also pre-hydrated. I wasn't hungry during the ride, but was famished for days afterwards. We did the ride on DH's 50th birthday, so we went out for a very nice dinner when we got home.
Champagne and post century drinking was not so great; actually, I think I needed to eat more immediately after the ride and waiting the 2 hours until dinner was the culprit of my weird feeling. I did have a Clif Bar and a banana on the way home, but I felt like I could have eaten a whole meal.