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31mpg is not very efficient. Lots of current diesel engines in Europe are certified at 50+MPG. There's even a Car and Driver test where, with very efficient (and boring) driving you can get 70+MPG out of a Diesel Cruze...

https://www.caranddriver.com/news/a15341744/the-prince-of-pa...

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The U.S. uses a Gallon measurement which is about 20% smaller than an international one so you have to factor that in.

That Car&Driver article is written in California, so I would have guessed it's US gallons, but now you're making me doubt :D

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