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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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