If not gone, then close to gone. Even the VW gassers are catching up. and when you factor in price premiums for diesels--assuming they ever sell them here again--then you may have no relative advantage anymore.Fact of the matter... In 2009, as far as economy is concerned, VW was really setting a standard with their diesel vehicles. Only the Hybrids could come close, and we all know there is the fun to drive factor to consider. However, in 2015-2016 The TDI is not such a diamond in the rough. You can pull 35-39 MPG out of a Ford Focus and pay less for gasoline. I would rather drive my TDI than a Focus, but the TDI is not special anymore when considering economy. Sure it is a diesel, But that just translates to paying more at the pump and costing more to fix when something fails.. The Economy advantage that the TDI used to have is long gone. IMO.
I have to wonder whether VW wouldn't have been better off adding the AdBlue in 2009, charging a little more and sweetening the deal with a longer basic warranty and service plan just for the diesels.