The search for less toxic alternative fuels is leading in many promising directions, one of which is bio-gas. Effectively a form of natural gas made from plants, the fuel was used this week to speed a modified B7 Audi A4 quattro to a bio-gas world speed record of 203.3mph (327.2km/h) on a test track in Germany.
Despite running on a mixture of methane and other gases generated by the controlled decomposition of grass clippings and sawdust, the Audi A4 used for the speed record generates a massive 585hp (430kW) from its overbored twin-turbo 3.0L engine. The project was completed as part of the Community Center of Excellence program at TUV Rheinland, with help in construction and execution from local tuning and transport companies.
Source: Motor Authority