Fuel economy of various jetliners
https://en.wikipedia.org/wiki/Fuel_economy_in_aircraft
over 6,000 n.miles, 11,000 kilometers
747-400 = 11.11 kg/km (39.4 lb/mi) or 3.26 L/100 km (72 mpg-US
777-300ER = 8.49 kg/km (30.1 lb/mi) or 2.84 L/100 km (83 mpg-US)
United 747-400 seating capacity
https://www.united.com/web/en-US/con...7/default.aspx
= first 12, business 52, economy plus 88, economy 222, Total 374
United 777-300ER seating capacity
https://www.united.com/web/en-US/con...0/default.aspx
= business 60, economy plus 102, economy 204, Total 366
With about the same number of seats, the 777 is (?) more fuel efficient as the 747.
kg/km = 23%, lb/mi = 23%, L/100 km = 13%, and mpg = 13%
When jetliners fly thousands of miles each and every day, that's a lot of fuel savings per plane. And this one statistic has had more impact than others on why twin engine wide body aircraft are replacing four engine aircraft.