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On the tv show Gearz lastnite they showed a product called Fuel Smart, they said it turns off the injectors when you are under deceleration.
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Only benefit would be more fuel cut.
i.e. I know my Nissan ECU has fuel cut on 2500RPM, and then deceleration mode from 2500 RPM to Idle.
From the rough description posted, Fuel Smart sounds useless, pretty much all ECUs would cut fuel when RPM high and Throttle 0.
What if throttle is > 0 - air only though?