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Just deactivating the injectors won't work. The problem is you're still pumping air through the engine, which requires work. The way the OEM's do it is they shut off the valves to the deactivated cylinders, so that the trapped air simply acts as a spring and you don't have the pumping losses. Even so, the OEM's are seeing only about a 15% increase in fuel economy with cylinder deactivation.
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