I'd still like to know what the story is with compressed natural gas—it seems to be a good solution if the infrastructure would ever appear—but anyone afraid of the death of the performance car should take a good look at this as 300-horsepower natural gas-burning Mustang GT, as Autopia reports.

Here's the rundown on this one: German natural gas conversion specialists Green Autogas and tuner Rollin on Chrome redesigned the Mustang's 4.6-liter V8 to run on propane natural gas. Once they had that going, then they installed a body kit, a carbon-fiber hood and monstrous 22-inch wheels.

So it's not subtle. However, the CNG engine "produces about 20 percent less CO2 than the gasoline engine it is based on and 95 percent less nitric nitrogen oxide (NOx) than a typical diesel," according to the report. Not bad...