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Ever since the debut of the Audi R10 in 2006, the mighty diesel-powered sports cars have been running on a gas-to-liquid (GTL) diesel fuel supplied by Shell. For the 2008 running of the 24 hours of Le Mans coming up in a few weeks, Audi and Shell will try a new blend that combines the GTL fuel with a BTL (biomass-to-liquid) fuel supplied by Choren. Choren is a German company that has been collaborating with Audi's parent company Volkswagen to develop the BTL diesel branded as SunFuel. Like cellu

Germany's Chancellor Angela Merkel has inaugurated the "first refinery of second generation" biofuels in Freiberg. The plant, owned by Choren, which partners with car companies VW and Daimler and the Shell oil company, produces BTL (biomass-to-liquid) fuel from any kind of biomass, such as wood chips, straw, weeds or leftover milk rejected by the agrofood industry.

Volkswagen has bought a German biofuels manufacturer CHOREN Industries GmbH to help promote their development of their second generation synthetic fuel. CHOREN is developing biomass-to-liquid technology that can produce sulfur-free diesel from many kinds of biomass feed-stocks. The company has the first commercial scale BTL plant in progress right now in Freiburg, Germany and it should start production in the first half of 2008. Volkswagen, along with Daimler, has been working with CHOREN to dev