I've been having a few beers every evening for as long as I can remember. No, make that at least 30 years or so; much longer than I can actually remember.
As of now I've come to the conclusion that four beers per evening is just about right. Sometimes I have one Scotch or Gin and Tonic followed by three beers, but that's about the same difference.
If I drink less than that I don't really get that nice beer buzz that caps the evening off so well. If I drink more than that the morning run is not as easy as it should be.
How about you? What's your optimal daily beer consumption (ODBC)?