The larger 112-inch Trent 7000 is 11% more efficient than the 97.5-inch Trent 700 engine, a 2% loss is due to increased weight and 1% due to additional drag from the larger engine, but the sharklets and aero optimization regains 4% for a 12% fuel advantage per trip.
Furthermore, fuel consumption per seat is improved by 2% due to the rearranged cabin (Space-Flex and Smart-Lav) with increased seating, offering a 14% fuel burn reduction per seat for the new −900neo compared to the previous 235-tonne −300 version.
The newer 242-tonne −300 is already 2% more efficient.

Airbus unveiled a distinctive cockpit windscreen to be featured on the A330neo, similar to that on the A350, and promised a new interior concept offering a better passenger experience on the A330neo.
Initially based on the largest 242t MTOW A330, Airbus is studying an improvement to 245 t (540,000 lb) MTOW for the A330neo, which would match the figure originally given for the Airbus A350-800 before it was sidelined in favor of the A330neo.
This would give the -900 a 7,000 nmi (12,964 km) range to better compete with the 787-9’s 7,635 nmi (14,140 km)
Since the fan is enlarged from 97 to 112 in (250 to 280 cm), the nacelles are mounted higher, necessitating extensive CFD analysis to avoid supersonic shock wave interference drag, as is the first slat's dog-tooth.
The wing twist and belly fairings are tweaked to approach the lowest drag elliptical span-wise pressure distribution changed by the larger sharklets, like the flap track fairings shape to lower form drag.

On the -800 at FL400, cruise fuel flow at Mach 0.82 and low weight is 4.7 to 5.2 t (10,000 to 11,000 lb) per hour at a higher weight and Mach 0.83.
The larger 112-inch Trent 7000 is 11% more efficient than the 97.5-inch Trent 700 engine, a 2% loss is due to increased weight and 1% due to additional drag from the larger engine, but the sharklets and aero optimization regains 4% for a 12% fuel advantage per trip. Furthermore, fuel consumption per seat is improved by 2% due to the rearranged cabin (Space-Flex and Smart-Lav) with increased seating, offering a 14% fuel burn reduction per seat for the new −900neo compared to the previous 235-tonne −300 version. The newer 242-tonne −300 is already 2% more efficient.
Airbus unveiled a distinctive cockpit windscreen to be featured on the A330neo, similar to that on the A350, and promised a new interior concept offering a better passenger experience on the A330neo. Initially based on the largest 242t MTOW A330, Airbus is studying an improvement to 245 t (540,000 lb) MTOW for the A330neo, which would match the figure originally given for the Airbus A350-800 before it was sidelined in favor of the A330neo. This would give the -900 a 7,000 nmi (12,964 km) range to better compete with the 787-9’s 7,635 nmi (14,140 km)
Since the fan is enlarged from 97 to 112 in (250 to 280 cm), the nacelles are mounted higher, necessitating extensive CFD analysis to avoid supersonic shock wave interference drag, as is the first slat's dog-tooth. The wing twist and belly fairings are tweaked to approach the lowest drag elliptical span-wise pressure distribution changed by the larger sharklets, like the flap track fairings shape to lower form drag.
On the -800 at FL400, cruise fuel flow at Mach 0.82 and low weight is 4.7 to 5.2 t (10,000 to 11,000 lb) per hour at a higher weight and Mach 0.83.
Airbus A330neo