Shaun Murphy and his Cool Fuel crew head for America's heartland, seeking new ways to travel without gasoline. This time they're trying out fuels made from corn and switchgrass. There's even a plane ride fueled by corn whiskey. Plant-based cool fuels also play an important role in Shaun's road trip through Alabama and Mississippi, as he discovers a biofuel known as hempoline.
Only available in the US.
