We go with the 40-50 dollar per person per day figure. Most days we do not eat all 3 meals, since Disney meals are huge, even counter service. My wife and I split alot of meals do to their size too. This figure will work well and we usually never even come close, we do stock up at the grocery store for goodies, snacks, pop and alcohol, last one is a big money eater at the world and we like informal lunches at the pool every day, hence we pick up sandwich fixing at the store. We splurge on a table service a couple of times in our trip, usually 8-12 nights so we eat carefully and accordingly.