The fuel figures quoted on here don't really match up with what Airbus is claiming and I doubt they are claiming less then what the aircraft will actually end up burning. Airbus is claiming up to a 15 percent improvement in the NEO. 3.5 percent of that is from the winglets. On short flights because of the increased weight over the classics the decrease in burn is even less. More then likely between winglets and other airframe mods the actual fuel burn improvement from the geared engine will be around 10 percent if not less. They are still a long way from flight tests and there are still unresolved engineering issues with the wingbox.