Seems a Boston-based outfit called Intellaprice did some surveys on drinking and reported the following:
On average, the lowest cost for drinking in bars and restaurants seems to be in Oklahoma City. That's the good news. The bad news is you have to be in Oklahoma City to take advantage of the low cost of drinking.

The most expensive place to drink in the US? Appparently, it's Washington DC. So that would be bad news/bad news: not only are you paying more, but you're drinking in DC.
