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May 16, 2008 10:46 AM PDT
Audi also claims the title of the world's cleanest diesel for its new diesel engine, found in the A4 TDI. According to Audi, the diesel A4 achieves a 35 percent improvement in fuel economy compared with the 3-liter gasoline model. Already on sale in Europe, the A4 TDI is slated to make its way to the United States later this year.
