Just an observtion on the matter of choosing between turbo or non-turbo.

With gasoline engines there is still "that" choice (turbo, non-turbo) but with modern diesels be it large or small displacement a great majority are de facto turbo intercooled with a form of direct-injection.

I guess what I'm driving at (pardon the pun) with diesels there is a clear cut advantage with turbos but on gasoline engines as with what Niky notes real world results are mixed.