I’ve always tipped 20% for good service and 15% for average or below. I usually don’t tip less that 15% unless it’s just abysmal or I’m picking up a to go order in which case I usually do 8-10%. Several of the restaurants around me have changed from 15% / 20% on the suggested tip to 20% / 25% and a few have even added 30%. And I’ve also noticed the suggested tips are calculated on the after tax amount, and some restaurants that charge a credit card processing fee calculate the suggested tip on that amount. I tip on pretax and pre-fee totals and cap at 20%. If it get worse, my eating at restaurants will start becoming less and less.