And to add to what Bob said, that is exactly why diesels are so much more efficient at light loads....they take in a full charge of air and only meter enough fuel to maintain the RPM's they are set for. So the air/fuel ratio varies as needed. But a gasoline engine has to have a critical mixture of gasoline to keep running, the total mixture is doled out via the throttle plate. So the air/fuel ratio is more constant, only the volume of this mixture changes. Maximum efficiency is achieved at or near full load.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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