When Boeing launched the 757 and 767 aircraft, they widely touted it's improved fuel efficiency relative to previous airliners. Notably:
- Delta stated that the 767 was "quieter and 30 percent more fuel-efficient than Delta's older jets it replaced." Source
- Guy Norris stated, "aerodynamic improvements contributed to the 30% fuel burn savings that were claimed for the 767 over previous types" Source
In what ways did Boeing engineer's improve the design of the aircraft to lower the fuel burn of the aircraft? Of course, propulsion advances (e.g. GE's CF6 engine) played a huge role. However, my interest is in other aspects of the design, most specifically the design of the wing and other aerostructures.