Originally Posted by
TurningFinalRWY36
On a 15hr sector with new generation jets you are looking at about 300kg of extra burn for every extra tonne of fuel carried. Can only imagine what burn old generation jets had on a comparable sector
On an A380 MEL-LAX with a 13:30 flight time the burn will be between 400 and 500 kg/tonne of extra fuel or payload. It's 484 today at 14T under MTOW.