I don't know if this will help you or not. I did a ride close to the length of a 60 k this weekend.
(41 miles) I ate an average breakfast, followed by a hot chocolate.
I drank only water after that, and did fine until about mile 35 when the stomach started growling. I got to feeling tired after that, so I stopped and ate a bar and within 5 minutes enough blood sugar hit me that I picked my speed back up again.
DH told me I should have had that bar earlier...
but I don't drink a lot of those sports drinks unless it is very hot and I still drink more water than anything.