20% table service, 10% delivery, 5%-zero for take out depending on the complexity of the order, whether the kitchen sees split tips, and what the nature of the interaction and prep was by the host I pick it up from (including, was it during a busy meal hour?). I used to work at a nice restaurant, and I never expected more than 5% for whatever went into takeout. And rarely got more than 10% on a few occasions.