My record mid-ride meal happened on a solo century from Vancouver, USA to Olympia, WA. I'd hit a convenience market at mile 30 had a roast beef sandwich, chocolate milk and a couple fig newtons, then at mile 34 I saw a burger joint and thought to myself "You know I could still eat at least half a horse", so stopped in and ordered a burger, fries and milkshake. I just snacked on the rest of the sleeve of fig newtons 'til mile 66 when I got a salad. Then I felt kinda sluggish and weary 'til mile 85 when I got my second wind, was almost tempted to keep riding all the way to Seattle
