I went yesterday at Vino restaurant in NDG. Excellent Italian food. But when I paid my bill, I was surprise that the preselected amount of tip on the credit card machine was 17% (after taxes)! So, I choose to put tip in dollar instead of percentage.
For me, 15% before taxes is a fair amount of tip. And when the amount exceeds 200$, I think 10% is fair. Am I wrong?