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^ Well in the performance world throttle body spacers DO work to improve hp and torque all accross the rpm band.
So with that in mind, it does change something. How that translates to better fuel efficiency? Well, the engine is making more power because its more efficient and this mod does not add air (turbo/supercharger) or increase air consumption, it simply changes the way the air travels. This should in theory improve mpg's.
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