Now BMW is jumping on the eco bandwagon - at least according to German car mag Auto Bild.
The German journos reckon that BMW is currently hard at work on a production version of the dramatic Vision Efficient Dynamics concept coupe that it revealed at the 2009 Frankfurt show - and that a hot M version is also waiting in the wings.
The regular car will be called the i100 and is due to hit showrooms in 2013.
The rumoured M version, says Auto Bild, will use a straight six from the next generation M3, coupled to a super capacitor to give it a clean, green power boost. Now that's the sort of eco sports car we can imagine having some serious fun with with...