I was 4 days into a 7 day trip to WDW when I noticed that I had an 18% gratuity added to all of my meals. In UK we do not have this, we tip at our discretion and it is not usually based on a percentage of the bill. Is it acceptable to ask for the gratuity to be left off the bill when I ask for it? I would much prefer to leave a cash tip of an amount of my own choosing. Which brings me nicely to my next question, is 12-18% the norm in USA? Usually I would tip £5-10 (roughly $8-16) depending on quality of food and service etc. I very rarely tip at a buffet style restaurant as apart from my drinks, I have served myself.