Most Fuel-Efficient Aircraft

Measurement Method

Fuel efficiency in commercial aviation is most meaningfully measured in litres of fuel consumed per 100 passenger-kilometres (L/100pkm) — analogous to a car's fuel economy but accounting for all passengers carried. This normalises for aircraft size and load factor, enabling fair comparison between a 100-seat regional jet and a 400-seat widebody.

The calculation requires: total fuel burned on a specific route ÷ (distance × passengers carried). Published figures typically assume an average load factor of 80–85% (airlines rarely fly completely full or completely empty). Some sources report in grams of CO2 per passenger-kilometre instead, converting via the factor that burning 1 litre of jet fuel produces approximately 2.54 kg of CO2.

Note that payload-range trade-offs matter: an aircraft optimised for 4,000 km routes will look less efficient if forced to fly 10,000 km carrying extra fuel that reduces payload capacity. Efficiency figures are always specific to a mission profile.

Top 10 Most Fuel-Efficient

Approximate fuel consumption figures for typical medium-to-long-haul missions at 85% load factor:

• Airbus A220-300: ~2.5 L/100pkm — the most fuel-efficient narrowbody in service; Pratt & Whitney GTF engines deliver 20% improvement over older generation
• Boeing 787-9: ~2.6 L/100pkm — composite construction and GEnx/Trent 1000 engines set the widebody standard
• Airbus A350-900: ~2.7 L/100pkm — XWB (extra-wide body) optimised for efficiency; 53% composites by weight
• Airbus A320neo: ~2.9 L/100pkm — LEAP-1A or PW1100G engines; Sharklets; dominant short-haul platform
• Boeing 737 MAX 8: ~3.0 L/100pkm — LEAP-1B engines; Advanced Technology Winglets; 14% better than 737-800
• Airbus A321neo / A321XLR: ~2.8 L/100pkm — longer fuselage; more seats per litre burned
• Boeing 777-9: ~2.5 L/100pkm (projected) — GE9X engines; folding wingtips; not yet in service as of 2024
• Embraer E195-E2: ~3.1 L/100pkm — most efficient aircraft in the 130-seat regional category
• ATR 72-600: ~2.0 L/100pkm — turboprop; most fuel-efficient commercial aircraft per passenger-km on short sectors
• De Havilland Q400: ~2.2 L/100pkm — turboprop regional; excellent under 400 km

New vs Old Generation Comparison

The fuel efficiency gap between current and previous generation aircraft is substantial:

• A320neo vs A320ceo: 20% improvement (engines + aerodynamics)
• 737 MAX 8 vs 737-800: 14% improvement (engines + winglets)
• 787-9 vs 767-300ER: 25% improvement (composites + engines)
• A350-900 vs A340-300: 25% improvement (composites + twin vs quad)

Turboprop Efficiency

Turboprop aircraft — the ATR 72 and Dash 8 series — are dramatically more fuel-efficient than jets on routes under 500 km. Propellers convert fuel energy to thrust more efficiently than turbofans at low speeds, and the lower cruise altitudes (15,000–25,000 ft) reduce pressurisation energy. The trade-off is slower cruise speed (450 vs 840 km/h) and passenger perception of comfort on rougher sectors.

Data Table