What on Earth have you guys
What on Earth have you guys been smoking. Diesel technology is intrinsically more efficient than Petrol - roughly 20% more efficient in fact. On top of that, with particle filters, Diesel is actually also cleaner than Petrol.
Of course the Dieselgate does not help making the case but bringing the emissions in line with the specifications has not dramatically affected the fuel economy has it? worst case the performance might have been affected. Where are you getting your information from?