Perhaps the data are commingling true sit-down service with take-out and pickup-at-the-counter service. Does anyone actually tip for take-out, or when you are h

Perhaps the data are commingling true sit-down service with take-out and pickup-at-the-counter service. Does anyone actually tip for take-out, or when you are handed your order at the counter? That would be bizarre... there was no waiter or waitress involved, why would you tip. But those tabs are rung up on the same machine.