I struggle with that same issue.
I find myself looking for any sign of extra service out of the waiter then just bussing at the table. It is a case by case scenario for me.
I am surprise to read of a range of 10 to 20% in tipping in the US. Being Canadian and often traveling on business to head offices in the US, I was strongly urged to tip high (20% to 30%) because waiter wages in the US are miserable.
In Canada, minimum wages are much higher compared to US so 10 to 15% tipping is close to the norm. By the way, 15% is easy to calculate because it is the amount of taxes added to the bill (In Québec) so you just take that number for tipping (no math involved).
Luc
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