I am an old fan of diesels. I have owned many diesel powered cars. I am driving a 2D Saloon since 2002 and its done slightly above 100k by now. On motorway at speed limits I do get 16 km / ltr. With a 55 ltr tank the new one can easily do 800km in one fill.
The great thing about diesels is that the fuel average is not very sensitive to A/C, city or motorway , speeds etc. For all kind of driving you get almost same average.
As far as market of 2D is concerned its still good. I am planning to sell mine in a few days as I am still getting good offers. In hilly areas like Dir, swat etc and in interior Punjab, there is a lot of demand. No worry about resales.