I made an unscheduled call to Wetherspoon's Cherry Moon in Huddersfield last week. What surprised me was a statement on the chalkboard that the pub had sold 2315 pints of cask ale in the previous week placing it 25th in the Wetherspoon estate for cask beer sales. 2315 pints = 330 pints per day which is about 4½ firkins. This struck me as being a reasonable amount but nothing special considering that this is a busy pub open at least 14 hours per day.
Wetherspoon owns over 800 pubs. If that is the volume sold by the 25th ranking pub how much does number 815 sell?