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The K&N will allow more air to flow through it. However, the stock filter doesn't become a restriction until you are really trying to pull a ton of air through it (if it does become a restriction at all). In order to pull that much air through the filter you need to have the pedal mashed to the floor and your rpms need to be near redline. If you are in this situation often enough to effect mileage I highly doubt you are worried about your mileage. If you redline through the gears on occasion its not going to kill your mileage drastically. I occasionally have fun in my Paseo and still manage decent mileage I'd say.
Was it a waste of money? Eh, you don't ever have to change the filter, and you don't have to go buy new ones so that is a plus.
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