Tip well enough that your generosity will be noticed by the staff. There are advantages to tipping at the 90-th percentile (not a 90% tip!), especially if you

Tip well enough that your generosity will be noticed by the staff. There are advantages to tipping at the 90-th percentile (not a 90% tip!), especially if you are a frequent customer. You will be remembered. Note, "asshole" has nothing to do with it.