Filed under: Motorsports , Audi , Porsche , Diesel Audi R15 TDI leading Petit Le Mans - click above for high-res gallery The American Le Mans Series ran half of its annual flagship race this past weekend at a rain-saturated Road Atlanta track in Georgia. The race marked the first anniversary of the inauguration of the ALMS Green Challenge, and in spite of the truncated race length, organizers announced winners in both the prototype and GT categories and the winners all came from the Volkswagen Group. Among the prototypes, the No. 1 Audi R15 TDI led for more than four hours until shortly before the race was red flagged. However, the combination of the diesel’s fuel efficiency and performance gave the Audi sufficient points to be declared the Michelin GreenX Challenge winner. Among the GT cars, several problems hurt the performance of the cellulosic E85-fueled Chevrolet Corvettes. Thus, the Flying Lizard team’s Porsche 911s had the best combination of carbon footprint and performance. With only one race remaining at Laguna Seca, the Porsches look like strong contenders to win the season-long Green Challenge championship. Galleries below, official press releases after the jump. Gallery: Audi R15 TDI at Petit Le Mans 2009 Gallery: Flying Lizard Porsche at Petit Le Mans 2009 [Sources: Audi, Porsche] Continue reading Audi and Porsche win Michelin GreenX Challenge at Petit Le Mans Audi and Porsche win Michelin GreenX Challenge at Petit Le Mans originally appeared on Autoblog on Mon, 28 Sep 2009 18:58:00 EST.

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