Yes and no. The diesel engine isn't pumping against a throttle plate at part throttle unlike a part load gasser. Gains there. However a diesel, gas turbine, combustion boiler, wood stove etc. They all loose/waste combustion heat up the stack. If more air is entering the combustion chamber than what is required for complete combustion. The extra air just gets heated but doesn't take part in the combustion process.Then carries the heat out of the stack. Some stationary gas turbines actually restrict the airflow into the engine at part load. That's why when looking at the Nebraska tractor tests. Diesel fuel efficiency at loads under 75% ranges from fair to poor at 25%. As a "broad, general rule of thumb" A diesel makes the most power per gallon of fuel when loaded down to the point of seeing "a little exhaust smoke". The air-fuel ratio will be down at about 15-16 to 1 with about 1% oxygen going up the stack of the 21% coming in. This is one of the reasons a turbo diesel enjoys higher efficiency. At part loads the turbo is just rolling without pressurizing the combustion chamber with un-needed air.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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