Take Friday off and ride easy on Saturday with a couple leg openers. Eat a bit more than normal the night before (like an extra bowl of cereal or something) -- not enough to throw you into bowel movement issues in the morning. Bring more gels and a couple energy bars. Eat your first at 45 minutes, and see if you can eat something in another 30 minutes, if not, see if you can eat something every 15 minutes until you can, then restart your timer. Bring one bottle of sports drink and one of water. A third (24oz) bottle in a pocket if it's 100 degrees or more.
You should be fine.