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The biggest source for the diesel's higher efficiency is the lack of throttling losses, particularly at lower loads. In a gasoline engine there is a pressure loss across the throttle plate of up to 18" Hg. This results in less energy use in pumping or sucking the air in. Some of this advantage is lost in the higher exhaust losses of the diesel. This is also part of the reason a turbo is so much more effective on the diesel than the equivalent gas engine. The next most important is the higher compression ratio.

Diesel efficiency and Aircraft Engines in WWII
Just For Fun Off Topic
Replies 23 Post by Jim Nation