I have yet to master eating that much at one sitting while riding. I would shake my head in wonderment when riders would sit down at the 200 mile mark and polish off a Whopper, fries and a drink. Brevet people are different.
When I toured for 6 weeks I was eating about 6000 calories per day and lost 10 pounds. I can eat a lot on a ride but certain things don't work. Actually not as much as I used to.
There is a BF member, Biker395, and I have ridden with him when he eats unbelievable amounts of food. He's 40 pounds lighter than I am and he's done endurance racing, doubles, and RAAM on a 4 person team.