That's because a diesel or gas turbine has lousy part load fuel efficiency. The extra air swept through the engine that isn't used in combustion. Just carried heat out the stack instead of performing work.
Of course a diesel at 90% load at 1700 rpm making 40HP will burn less fuel than the same diesel operating at 2400rpm, making 40HP and operating at 64% load.
Take a look at the fuel consumption curves of a diesel making 20% of rates power rolling down the road vs a gasser making 20% of rates power rolling down the road.
Also compare fuel efficiency of a 90% loaded diesel at it's peak torque rpms and a port or direct injection gasser making 90% of rated power at it's peak torque rpm.
Don't waste your time either talking about engine life when operating at 1500 and 3500rpm in momentary duty cycles in the light duty cycle of a pickup truck.
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