Don't let that toothily grinning shark-mouth charm you: the Fisker Karma might have the roguish looks of a high-horsepower luxury sedan, but it in fact belongs to the tread-lightly school of super-attractive performance green cars that're turning out in droves at Detroit this year. A center-mounted Li Ion battery pack supplies the Karma's power until it reaches the end of its 50-mile range; then an efficient 4-cylinder kicks in to pick up the slack. Alternately, the electric and gas motors can be run in concert for peak performance. What kind of performance? Fisker's promising 0-60 in just under 6, and a top speed of 125 mph. This 100-mpg beauty can be had for $80,000 to $100,000, and is purported to be availabe in 2009. More at Left Lane News.