Well, in my way of thinking, *bonk* is the depletion of glycogen. If you look at your basic physiology burning fat yields just half the ATP (chemical energy) per Oxygen molecule as burning glycogen. People can store about 2500 calories of glycogen and they get about 50 calories per mile. When you use up your glycogen, you are down to half power. You just can not sprint to save your life. From reading Preston's description, I get the impression that Preston's experience with the bonk is similar to mine.
Preston, I noticed that you are a Florida rider. Are you going to do the Horrible Hundred the week after next? It is a good ride.