If you’re a traveling salesman who wants high fuel mileage, sure, you could order the new 2010 Toyota Prius. But a clean-diesel-powered car might actually serve you better than a hybrid. We were reminded just how efficient diesels really are after spending a weekend with a European 2007 Audi A6 TDI diesel.
Over more than 500 miles of high-speed travel, through the hills and fields of upstate New York, we averaged an astounding 39 miles per gallon. And this is no economy compact. It’s a midsize German luxury sports sedan with crisp styling, lots of electronic frills, and the torque of a freight train.
The car we tested was provided by Robert...
Read More