I answered that coffee makes a difference; but I don't know how much of that is psychological for me. I just love starting the day with coffee. Other than that, I don't really eat much on even the longest rides. In fact, my wife and I just did a wonderful century together on the Central Coast. I started the day with coffee and a chocolate croissant; then these little Kalamata olive and tortellini snacks at a couple of the stops and I had a hella strong ride right through the finish. I'm an easy keeper, though. I would not necessarily recommend this to other riders. Needs vary.

Edit: the night before the ride I had a pasta and seafood dish. So, that was the carbs. I figured they would last me throughout the following day. But, again, I ate minimally the day of the ride.