Quote:
Originally Posted by ChazInMT
Welcome. My understanding is that the cylinder cut out thing gains milage by reducing pumping losses. It makes the displacement of the engine smaller, therefore the throttle has to open more, thus your pumping loss goes down. Since pumping losses are not a huge loss to begin with, you are not likely to realize a very dramatic gain.
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we cut cylinder activation by removing fuel pulse, so if we're removing 2 cylinders out of 6, we gain 33% economy (excluding the pumping loss of compressing the cut cylinders) right off the bat, plus the lower pumping loss of the "more open" throttle body.