My 767 has GE engines and uses about 5T/hr (2.5T each).
In my simplistic red wine induced state, I thought that the old jet jobbie was more efficient when working hard, so the the designer bloke would have specified a donkey of the right size to do the job in hand as opposed to throttling back an over sized unit. (Unless of course he designed small Airbuses which could do with a lot bigger engine all round, seeing as they always seem to be geeting in the way these days-term of endearment and I am now going to bed ready to apolagize in the 'morrow!)
SFD