Hi,
I don't knowif it's true, but I have read one day that diesel engines need less fuel because diesel fuel has more energy than petrol fuel.
By the way, did you heard about the VW 1.4L TFSI engine, with both supercharger and turbocharger ? It produces 170 hp and 240nm, which is very good for such a little engine, and doesn't use much fuel, compared to other petrol engine of this power, of course
Isn't it a better engine to compare diesel to ?