Catching On to the Quiet Efficiency of Diesels
The diesels are quiet as well as smoke-free. The Audi R15 runs on a special form of gas-to-liquid (GTL) diesel refined from natural gas by Shell Oil in Malaysia. The GTL is a particularly clean-burning diesel, and the remaining exhaust is scrubbed by two particulate filters. Many see GTL as a precursor to the process that may be used to synthesize biofuels from algae or waste products.
Read more: Diesels From Audi and Peugeot at Le Mans - Why Audi and Peugeot Diesels Rule the Le Mans Raceway - Popular Mechanics