Prompt refills are a must. When waiters/waitresses bring me refills on time and without even asking...I have a hard time not giving 20%.
In general its the attentiveness of the server that results in better tips from me. I'm not asking them to be perfect, but I am asking them to give me a reasonable amount of attention. Mistakes can be made and I won't take offense, but not paying attention to me, the customer, that is grounds for no tip.
I can understand that sometimes it gets very busy in the restaurant, and that I can't be the center of the world for my server. This doesn't mean I'm not going to tip, but the tip will not be outstanding either. Tips are based on merit, not circumstances. I figure that I might not have given the best tip, but if things are busy then my waiter/waitress is most likely making up for it with the extra business.
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Anticipation is a killer
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