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Old 02-21-2013, 01:37 AM   #3 (permalink)
ChazInMT
Aero Deshi
 
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Join Date: Jan 2010
Location: Vero Beach, FL
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MagMetalCivic - '04 Honda Civic Sedan EX
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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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