Frankfurt 2009: Audi A4 and A4 Avant go biofuel in Germany

Filed under: Ethanol , Flex-Fuel , Audi , Germany Audi A4 - Click above for high-res image gallery Audi’s big green reveal from the Frankfurt Motor Show is undoubtedly the e-Tron electric supercar - especially considering the recent comments about electric cars and diesels made by Audi North America President Johan de Nysschen.

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