I'm wondering if the article in Wikipedia is really based on "alcohol consumption" and not Alcohol reported to be sold in the country?
There is a clear reason why Luxembourg is on top. The taxes on alcohol is (very) low in Luxembourg and a lot of people from the countries closed to Luxembourg (Belgium, France and Germany) are buying their alcohol there. We don't forget the travellers (Luxembourg is a crossroad in EU) making a stop in Luxembourg...
I hang out a couple times a year in Europe with a group of primarily Irish, Germans, and Danes and the Danes are the only ones I ever see drinking at breakfast. They're also the only ones who've ever commented on the fact that I wasn't having a beer at lunch...
That list doesn't account for the type of alcohol. A liter of whiskey would do more than a liter of beer. Point: Australia could be drunker if they drink relatively more hard alcohol than those higher on the list, giving mahmud the win.
There is a clear reason why Luxembourg is on top. The taxes on alcohol is (very) low in Luxembourg and a lot of people from the countries closed to Luxembourg (Belgium, France and Germany) are buying their alcohol there. We don't forget the travellers (Luxembourg is a crossroad in EU) making a stop in Luxembourg...