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in lean burn you want to cut fuel not add air. You might be able to achieve lean burn with your method (I doubt it) but you wouldn't increase your MPG because the fuel amount would be the same.
or as slownugly say, your MPG would probably go down due to the car running in open loop.
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Aerospace Controls Engineer.
Currently driving a mostly stock 2014 Mitsubishi Mirage DE hatchback.
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