You can also read my reply in my other comment.

But to keep it concise: The core problem is that you are stating a truism in response to a famous counter-example to specifically that truism. The other problem being that you are stating a truism which everyone else is already familiar with.

Given how many people have seemingly jumped on misinterpreting the truism as me making some claim of a specific fuel efficiency improvement, I'd disagree with people being already familiar with it.

To be concise as well: it's been duly noted by me that contributing to a conversation by attempting to bring in nuance is not always well received when you make up a hypothetical for a topic people are very touchy about.