OP, you got to look at he HP/Torque numbers at LOW rpms, which is where diesel produces a lot. Gasers usually have the HP/Torque in the higher rpm ranges and thus may not be able to compete. Another apples/oranges comparison. Diesels also can produce large amounts of HP/Torques in the higher rpm ranges and much of the stuff seen advertised for aftermarket is in that arena. BUT, who drives a diesel in the 3000+ ranges constantly? I drive at around 2350 at 80mph indicated and get 19mpg unloaded but the truck weights 7500lbs. My hyundai get 36 mpg at same speed but is not rated to tow anything and yes it is a DI none turbo etc.
Loco engines are diesel electrics, that is how they get to advertise only using 1 gallon of fuel per ton/mile. just think if they could get a small efficient generator in a car to make it gas-electric! But then the battery manufacturers would have a hissy fit because it would impact them and their product. So it not likely to happen to them or the diesel vehicles. Too many diesel engines out now with comparable mpg results, and remember it is actually cheaper and easier to manuf diesel than gasoline, just that they now say the usage rates require the higher per gallon costs since there are more gas vehicles buying fuel than diesel.
