All I Want for Christmas is a Biodiesel Hummer. No, Really.

| Tue Oct. 30, 2007 8:20 PM EDT

Think there are no real inventors anymore? That would be news to Johnathan Goodwin, proud creator of the world's most fuel-efficient Hummer.

By combining biodiesel and hybrid technology and reconfiguring engines, Goodwin can double the fuel efficiency of a number of giant American cars and nearly eliminate their emissions, using almost nothing but stock GM parts (OK, and the occasional jet engine). He's currently working on the Governator's 1987 Wagoneer, and is slated to overhaul Neil Young's 1960 Lincoln Continental.

As for the country's decaying car capital, Goodwin has little sympathy, pointing out that "Detroit could do all this stuff overnight if it wanted to."

—Casey Miner