Honda have just announced that their new i-DTEC will debut in North America in a 2009 Acura model. The engine will follow in a Honda the following year. No specific figures were given, but the company claims this diesel with be 25-30% more efficient than an equivalent gasoline-powered unit.
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According to my dealer (I was looking at a 335i) Bimmer diesels will be here 3rd quarter (incl. 330d and 335d).
I'll wait for those.