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Parks McCants    August 10, 2016 - 7:35PM

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Welcome Pete. What the Econ does in a 4 cylinder engine is adjust the throttle response,(you'll note a "dead" throttle peddle, and lower the fan speeds on the air conditioner, and, in some cases disengage certain belt driven auxiliary units such as the alternator( Mazda) to reduce engine loads. It's a matter of "combined fuel efficiency."

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