This guy is doing amazing stuff to some Hummers with some pretty basic technologies. I'd love to have the money for one of his upgrades and show it off to a Prius or two.
http://www.fastcompany.com/magazine/...d-messiah.html
"And when it's time to fill the tank, he'll be able to just pull up to the back of a diner and dump in its excess french-fry grease--as he does with his many other Hummers. Oh, yeah, he adds, the horsepower will double--from 300 to 600."
""Conservatively," Goodwin muses, scratching his chin, "it'll get 60 miles to the gallon. With 2,000 foot-pounds of torque. You'll be able to smoke the tires. And it's going to be superefficient.""