Qantas 'worst major airline' for fuel efficiency on trans-Pacific flights, study suggests - ABC News (Australian Broadcasting Corporation)
Are they comparing apples with oranges? If you're basing the survey on the number of passengers and cargo carried vs fuel usage, of course an airline which squeezes 500 passengers into sardine class is going to be more efficient than an airline with aircraft which have three or four zones of First, Business and Premium class seats with decent legroom ( which weigh far more than regular seats) and have a greater baggage allowance.