Normally when we have a meal (usually dinner) at a BYOB, we are paying enough for the meal that a 20% tip on the check seems right (and that's on the meal + 6% sales tax, so pretty adequate).
But we've found a great BYOB brunch place where the total tab is extremely low. After we left most recently, I wondered if we should be tipping more than 20% on the food + tax. As one of our party said, "If we had paid for the drinks, this bill would be at least $100 more." Probably true -- 9 Bloody Mary's, a bottle of Prosecco.
The total bill was $66; there were six of us. Service was outstanding. We left $15 -- about 23%. I think we need to really up the tip next time. What do you think? Thanks!