I've whined about the food available at El Tour before, but if you have a problem with bonking you really, really, need to make sure you carry what you need on the ride. There's no lunch stop, and those rest stops every 10 miles will usually have only water and bananas, and maybe cookies and grapes. And of course there are Krispy Kreme donuts at the first ravine crossing.
Since I'm allergic to bananas, I didn't find this enough to power through 109 miles. If I do the ride again, I will probably bring a sandwich or two, fig newtons, energy bars and gels, powders, and maybe a candy bar.
Have a great ride, and remember to keep eating (and drinking)!