On 26 May 2021 at 20:12:33 BST, "The Natural Philosopher"
wrote:

On 26/05/2021 18:01, newshound wrote:
Actually I would not be surprised if washing machines had not done that,
and aero engine efficiency improvement is probably in double digits over
a decade.

Bless!

Quite the ArtStudent aren't you?

Gas turbine efficiency as such us where it was from the get-go - about
37%. Once you have made the transition to high bypass turbofans, that's
pretty much it.

That still leaves room for aerodynamic improvements, plane weight improvements
and reducing the number of engines. So he may be right about overall
passenger carrying cost minimisation over recent years.

--
Roger Hayter