If possible, try to compare your K&N to equivalent baseline mileage. That is, try to duplicate conditions and see if it really makes a difference. Prevailing data is that K&N filters don't make any difference at all in most applications, though in some cars where K&N has done a lot of research the filters do help. I'd really like to find out.
Your manual transmission means you can really get a lot more improvement than if you had an automatic. You'll read all about the various ways you can improve here.
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