I am hoping that a 20D model builds on the information in this link from a year ago. That would suggest different engine tuning than the current 20D model in Europe and the ROW, and an emissions system that doesn't use urea injection.

BMW To Sell Us 4-Cylinder Diesels

4-zylinder diesels probably aren't as difficult to meet California emissions. The VW diesels (4-cyl) do not need the urea system at all, although they do have the DPF like in other countries.

The 335d I understand can get up to 40mpg if driven properly. I would imagine the X3 could do close to the same. And that torque - WOW! What a great combo.

I'll take one in AW, Thank You.