Think I did about 650 on a tank in the w210 turbodiesel. At any rate, it made it from Detroit to Dallas, a 1200 mile drive, with one fuel stop. The newer w211 car has about the same range. It gets better MPG, but the tank doesn't seem to be quite as large.
On the article, the Mercedes sort of won, but not really. It consumed a smaller volume of fuel than the Prius. But because diesel is more energy dense than petrol, the Mercedes used more energy. And of course it would cost a couple bucks more to buy 10 gallons of diesel than 10 gallons of regular. Still, the efficiency combined with the performance and comfort is very impressive.
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