it probably isn't legal in the US because of safety issues, it's overall size, and the fact that we are strict (too strict in my opinion) on diesel engines, especially the small ones.
I wish I were wrong. If I were I would get one today!!!! (well maybe not today but soon).
it is awesome that you can get a car like that where you are. we are stuck with either a hybrid or a smart as our best options and the smarts we have only achieve 40ish MPG. to us, that is dang good. and no, we can't get the diesel smart over here either. too polluting or some crap they are feeding us.
Be the change you wish to see in the world