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A higher flowing air filter gives the potential for increased power, and thus using more fuel. However, if you drive the same way you did before, you will notice you can have the same power output from a lower throttle position. The change in economy or performance rests with the driver.
In another thread somewhere, we went over air filters in detail, and found they don't have much of an effect on fuel injected cars, but a clogged air filter on a carburated car will hurt both power and efficiency.
In the long run, a cleanable air filter can save money and reduce waste, provided you don't damage the filter. I run a K&N in mine.
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In Reason we Trust
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