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For what its worth... I see a couple of comments in here about how having more airflow into the compression chamber would hurt fuel economy rather than help it. For me, a K&N air filter did improve my economy during light acceleration. I believe this was a simple 2mpg gain for my vehicle, but dont have hard data on it. Just basic fuel economy from tank to tank numbers. Now on the flip side, if I do stick my foot into the floor (grins most wickedly) then I do lose a bit of mpg... but oh the rush...(coughs and tries to not show too much red). As a final side, K&N does claim better fuel economy with their filters. I wager there are others out there that also make that claim.
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