On the other hand, San Miguel and Peroni are topping the tables when it comes to the least gassy beers - at least when it comes to lager. Joint second place was claimed by Stella Artois and Coors Light, with just over 2.55 pints of CO2 per pint, while Corona Extra (2.48 pints of CO2) came third.
What is it? Cask ale, also known as cask-conditioned beer or 'real' ale, is beer that undergoes secondary fermentation in the barrel. Using a hand-operated hydraulic pump, the beer is then drawn up from the cellar into the glass. The beer should never be flat.