Originally Posted by
Aero1900
If you compare a 767 to a 787, what percentage of the fuel efficiency gains is a result of the engine's compared to the aerodynamics and advanced wing design?
And to add to that, wouldn't a 767MAX just a worse version of a 787? How could that be a success?
I'd guess the some of the largest efficiency gains come from the composite (lighter weight) construction of the 787.