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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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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