Although I completely forgot it existed. There are not many diesel passenger cars on US roads. Diesel is consistently more expensive than petrol here.
Even my 15 year old diesel car had an efficiency of 1/22. Adjust you driving style and I'd get 1/25. Range: 1000km, with an ordinary sized tank.
It seems Americans haven't even started with efficiency, quite likely because there was no pressure to do so due to low fuel prices. Not in their homes, not in their cars, not anywhere.
Do you realize that other brands and models exist in the USA? Do you realize Tesla is and American company? Did you even check look into Chevy Cruze's mileage? Here's a guy getting 70mpg in a Chevy Cruze by driving 55mph on the highway. That's 30km/l.
https://www.caranddriver.com/news/a15341744/the-prince-of-pa...
Are American diesels this inefficient?? Looking at pictures online the Chevy cruze doesn't seem like a bigger/heavier car than a Passat, so what gives??