It's often difficult to reconcile being a petrol head with being green. There may be more green cars about now than ever before, and some of them are very good-looking indeed - as evidenced by the Sexy Green Car Show at the Eden Project. But there's good-looking, and there's ohmygod I'd rather own that than a Bugatti Veyron, which is where the Koenigsegg CCXR comes in. It's the sort of car that makes you think impure thoughts.
The CCXR runs on ethanol, which is not only better for the environment than petrol or diesel - yes, there are those who reject ethanol's green assocation, but there are also two sides to every agrument - but it is also better for the car's engine. As ethanol works to cool the car's combustion chambers, you get a higher octance value from the fuel, meaning more power and higher speeds - every petrol head's dream. Not only that, but Koenigsegg have said they can retrofit any CCX model to run on E85 ethanol. And if there's no E85 about, the engines can take regular unleaded if needs be.
So if you have a need for speed and a spare £400k, why not save the environment in the fastest, noisiest way you can? I'll bet any money it's more fun than a G-Wiz.