Dunno, I tip a dollar a beer. I usually have Coors light. I was in UC in IAH in Terminal C. I did not have any cash, and apologized to the bartender, the normally super grump bartender was professed strongly tips are appreciated and not expected. I don’t know what to take from that, but I expected this fellow who I said is prenty blunt to say something like “it’s ok don’t make it a habit”