A German LPG advocacy group called Green Autogas has teamed up with tuner Rollin on Chrome to build a natural-gas powered Mustang GT. The green (surprise, surprise) 'Stang puts out 300 HP via the LPG mill, yet produces 20% less CO2 and as much as 95% fewer oxides of nitrogen; since Europeans are taxed heavily on emissions output, that kind of power with a big reduction in pollution equals more fun for the buck. The car also gets 22-inch wheels and a carbon fiber body kit, but actual fuel usage figures — as well as a cost-per-mile comparison between a gasoline Mustang and the LPG Mustang — weren't provided. [Motor Authority]