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Hmm... I've never heard of anyone mean thermodynamic efficiency when talking about fuel efficiency of a vehicle. Maybe people who design aircraft engines do?

See e.g:

https://en.wikipedia.org/wiki/Energy_efficiency_in_transpor

> The energy efficiency in transport is the useful travelled distance, of passengers, goods or any type of load; divided by the total energy put into the transport propulsion means.



Ah, seems like then it's possibly a bit of column A and a bit of column B. I'll defer to you on the correction though, I was merely speaking from third-hand/watercooler type discussions about aviation as someone who is just a passive enthusiast of airplanes.




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