Audi A4

  • 2011 Audi A4 TDI

    German automakers have spent time and money on ad campaigns promoting clean diesels as the better way to improve fuel economy, so far with limited results. But that could change when Audi brings a TDI diesel version of its best-selling A4 model to the U.S. So far, its only TDI offerings are the Q7 full-size SUV and the A3 hatchback, neither one a high-volume model for Audi in the States. Starting what will likely be a lengthy campaign to convince luxury sports sedan buyers that diesel is sporty as well as economical, Audi released the results of an A4 TDI fuel efficiency test on the European...

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