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Audi was disappointed with its diesel-powered racing prototype at Le Mans this year, but it did manage to clock two other records: taking the lap record at the Sachsenring, and cruising 1,158.9 miles on a single tank of diesel.

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We Dive Deep With Audi's Revolutionary New Turbo Tech

An electric turbo system boosts efficiency between 15 and 20 percent, according to Audi.

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The list of finalists for the 2014 Green Car of the Year has been announced, and in a genuinely bizarre twist, there's only one hybrid and no electric vehicles among the five contestants, despite the arrival of cars like the BMW i3 and Tesla Model S. Taking the place of the EVs are a pair of diesels, repping a technology that last won a Green Car of the Year award in 2009, when the Audi A3 TDI took the title. No diesel was in the running for last year's award.

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You know our answer. While gasoline certainly holds a special place in our hearts, it's difficult to deny the efficiency and power available from diesel fuel. XCAR recently added to their impressive list of videos by putting two Audi A6 models to the test: one with the company's stalwart supercharged 3.0-liter V6 under the hood and another powered by the company's twin-turbocharged 3.0-liter diesel V6. Our host finds plenty to love in both engines, and while the video ultimately concedes that mo

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