Charlie, that's how I tip in bars and ALWAYS get rewarded with free drinks twds the end of my stay. I notice most people (even if they're paying cash) don't tip until right before they leave.

If one pays by credit card, PLEASE tip in cash...a buck or few bucks every round even if you started a tab. It's because staff has to deduct the credit card service charge (the company charges the bar) if tipped on credit card.
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"What I do know is that if Karen Carpenter and Mama Cass Elliot had shared that sandwich they'd both be alive today." -Michael K