2011 Detroit Auto Show: Porsche 918 RSR Hybrid Photos

While we certainly Porsche engineers care so much about trees and puppies as the next guy, they have not always been focused primarily on building environmentally friendly cars. It does often happen as a byproduct of building race cars, however. A passion for endurance racing is a passion for efficiency, which is a roundabout way to be good for the environment. Their latest ground pounding,