Originally Posted by
QuietLion
It's cruel to leave less than the customary amount when service is adequate. However, I resist lobbying by service people to inflate the customary amount. A 15% tip on the food portion of the bill is customary, with some extra thrown in if alcohol is ordered, but certainly not 15% of an expensive bottle of wine.
QL
The ones the servers love are, indeed, the ones who tip at 20% including the expensive bottles of wine. Common, too.