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The amount of air the engine consumes when FE driving, at light loads, is only a fraction of its full open throttle air, so any underhood pressure reduction would be really trivial. Tons more air is available from under the sides than is needed to supply the engine.
One issue with a warm air intake is that the computer may retard spark timing if the engine is knock limited, reducing efficiency and FE. If it's not knock limited you MAY pick up a bit of FE from the increased volumetric efficiency. YMMV.
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