I'm long out of the fitness and riding you're capable of but that one day ride I did when I was fit opened up a fantastic appreciation for every bit of food I was consuming. After about six hours of riding it seemed like everything I ate became energy in 10-30minutes and was GONE an hour later. I'd stop and fill up both water bottles, buy a 12oz bottle of orange juice and chug it down then head off with a bag of trail mix or a couple of energy bars to nibble on for the next 20 minutes or so eating small enough bites to thoroughly digest then recharge with small amounts of solid food an hour later. It was noticable how each different kind of food became movement.