Most people know that Jay Leno is a major car nut, but how many realize that he's also passionate about the environment? Of course his idea of a green-friendly supercar is somewhat removed from the norm, and after going through several design ideas on the back of a napkin, this is what he and his team came up with. The EcoJet is based around Corvette C6 chassis components housed under a sleek Cadillac-inspired body, but instead of a big V-8, there's a Honeywell LT-101 jet engine that runs on biodiesel mounted behind the seats. That's good for about 650 horsepower, although other performance figures were not released.