It's just the food. Americans eat way more fastfood then European people. And the menu's are way bigger also, a big order of frensh fries here in NL is the same as a small in US. Burgers a much bigger etc. Fastfood is also much cheaper. I mean, really, a McChicken for 1 dollar [link to www.mcdonalds.com] . We pay EUR 3,50.

Furthermore, when we buy a Coke overhere, you can't refill it for free, in USA this is normal.