[iarenaza]

Well, my 7 years old Mercedes A 180 CDI 2012 model (Diesel engine) averages 53 mpg (4.4 l/100Km) still today (see my old comment with all the details for the these numbers at https://news.ycombinator.com/item?id=14552816). The manufacturer-supplied official numbers are even better (3.3 to 3.6 l/100Km, or about 65 to 71 mpg).

NB: the above mpg numbers are computed using US gallons (3.785 litres)

[rutthenut]

Useful economy figures, for sure. It's the average across Europe that I'd find really surprising, given how many older vehicles there will be, and not all diesels