Oct. 22, 2006: The Washington Post

Summary: We were averaging 31 miles per gallon, which would not have been spectacular in a four-cylinder economy car. But this was a 2007 Mercedes-Benz ML320 CDI — a luxury midsize, all-wheel-drive, V-6 diesel sport-utility vehicle capable of pulling a trailer weighing 5,000 pounds and carrying 1,400 pounds of cargo.

The "CDI" in its name stands for "common rail direct injection," an advanced diesel technology used for nearly a decade in many European countries.

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