Originally Posted by rpenmanparker

For a few hours you can replenish 200 calories and burn 600-800 (that is what hard cycling uses up) and get away with it. You are using glycogen stores. But 11 hours? You are not likely to get through that without several days of extreme carb loading ahead of time and lots of preparation building up saddle time to that level. Just because you can only replace 200 calories per hour doesn't give you a pass on the extra you are burning. You have got to account for the discrepancy.

Sure, try to eat more in future. But 11 hours riding is no picnic. That is endurance riding pure and simple. You have to build up to that and prepare for it to not have some negative experience. Unless you are Wonder Woman. You're not Wonder Woman, are you? See, if I were you I would be very pleased, bonk and all.