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I feel obligated to point out that improved air flow through your air filter does nothing for mileage on a gasoline engine. The reason being that to maintain partial throttle cruise an restriction saved in the air filter has to be made up for by the throttle while the fuel and air flow remain the same. It improves full throttle power however.
Diesel engines have no throttle so any reduction in intake restriction reduces pumping losses as well as unburnt fuel (soot).
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