Can't think of the actual largest amount, but here are a few "sample meals" I have eaten over the years....
2 Fuddrucker's 1lb burgers, with 4 Dr. Pepper's to wash it down.
An Everett & Jones 3-meat combination BBQ platter for my b-day, when I finished, my girlfriend couldn't finish her meal so I ate the rest of hers. Then my sister and my niece couldn't finish theirs so I again ate the leftovers...plus 2-3 diet cokes and 4 cornbread muffins and the others' wheat bread.
I've had a dozen donuts and a quart of milk, and an hour later had more BBQ (on the road touring), and when I sat down, the band thought I actually bought their meals I had so much food with me.
Then again, that's nothing compared to what it looks like some people put down here...