I remember talking to german guys some two years ago at weston super mare where they had flown in in a German Army CH53 (unsure what designation) but it was a twin (two engine) and they told me their fuel burn was 1000 litres an hour with a total fuel capacity of 7000 litres. Whilst I suspected the three engine sea stallion would eb more, I am surprised by just how much more it burns by comparison.