The American Le Mans Series added the LMP Challenge class a couple of years ago as a lower cost entry point for sports prototype racing.  The LMPC cars use a common fixed price Oreca chassis powered by a production based +Chevrolet Corvette small block V8. Since the class was launched these cars have been fueled by E10 (10% ethanol, 90% gas).

ALMS is now investigating the possibility of converting the LMPC cars to run on compressed natural gas starting as early as 2013. That would make it the first major racing series to run on methane. In the LMP1, LMP2 and GT classes, various cars run on E10, cellulosic E85, diesel and biobutanol, making ALMS the most fuel diverse racing series in the world.  

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ALMS Exploring Natural Gas for PC Class | American Le Mans Series
BRASELTON, Ga. (June 20, 2012) – The International Motor Sports Association (IMSA), sanctioning body for the American Le Mans Series presented by Tequila Patrón, announced that it has entered into an …

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