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I actually got better mileage replacing my relatively clean K&N with a standard paper filter. It was nothing noticable. I could never get 35mpg (imp) with the K&N but I did with the replacement. That mileage is exactly the same as the best I had with the 4EAT. Basically the WRX 5MT will be equal to or improve mileage (depending on conditions) over the SVX 4EAT.
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