4cylinder turbodiesel trucks are incredibly popular down here.
My Nissan is 10 year old technology, 3 litre, 4 valve, direct injection. 150hp (3200rpm), 260ish ftlb (1800RPM)...in an 1800Kg vehicle, with rated load capacity of a tonne, and towing 3 tonnes braked...1.2 tonnes gross combination more than the V-6 in the same vehicle/year.
Way nicer to drive than the V-6, and gets 10km/l all day every day, versus the V-6 getting 7 on a good day.
In the last 10 years, the diesels have progressed seriously, with more power and torque. Mate's 2.5 has 20% more power, and 25% better mileage than mine.
Looking at workmate's new vehicles, it's their wives who are picking diesels after test driving petrol and diesels (at least in Subarus).