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Re:How Software in Half of NYC Cabs Generates $5.2M a Year i... by acjohnson55 on Monday January 05, 2015 @10:12PM (#8842725)
I speculate that people are less likely to tip barstaff than waitstaff, but I don't have any sources to back that up.
Re:How Software in Half of NYC Cabs Generates $5.2M a Year i... by mod on Tuesday January 06, 2015 @10:46AM (#8844855)
In the anecdata of my family & friends who have done both, they have come to expect a higher percentage on bar tabs (~20%) than on restaurant tabs (~15%).

There's a ton of factors to consider, of course. Some people get angry when drunk, some get loose with their money, some try to impress. Some people are surprised by large bar tabs and feel cheated. And all the normal factors, like that certain groups are notoriously tight with their money.