A different perspective
I’ve just seen a laughable web advert for Chevrolet cars, proudly claiming “Chevy offers 8 models with 30mpg highway or better. Fuel efficiency with a choice at chevy.com”
Now firstly, a little translation: 30mpg (US gallons) is 36mpg (imperial gallons) or 7.8 litres/100km.
It just shows how Americans view fuel efficiency if they think that 36mpg is something to shout about. It is not!
Note that ‘highway’ means extra-urban, not urban ‘about-town’ traffic. I would be very disappointed to be getting a figure as low as 36mpg in city traffic never mind on the open road.