While drafting off of a slightly faster group late in a non-stop century ride, I missed taking my scheduled e-gel at the 4.5 hour mark. After I got dropped, I was cruising in the 18-19 mph range and feeling fine, and then the bonk hit. Everything hurt at once. The engine sputtered if it fired at all. I was down to 13-15 mph and it was all I could do to take my last e-gel. A mile or two later, the cylinders started firing again and this was up a small climb. I finished the last 2-3 miles feeling strong and still cracked 5.5 hours for the century.