That would be quite optimistic, but this is something I’ve noticed at multiple restaurants myself. I saw the tip “suggestions” were not accurate so I checked to see what numbers they might have been using and tried the after tax amount etc, but nope the numbers are just inflated artificially. It’s happened with or without alcohol on the tab, with and without sale items, and I don’t ever really get anything “comped” unless it’s a sauce on the side or something. I wouldn’t say it’s a scam, but I did roll my eyes the first time I noticed it.