"I will also add - that anybody that saw a big jump in fuel mileage by adding a K&N air-filter, probably had a half-plugged filter to start with - or they drive everywhere at 4000 plus RPM."
I agree with you on this. I have a 7.3 Power Stroke I put a K&N system on, I gained a "little" power with it, it is a lot noisier, but my fuel milegage dropped by at least 1-2 MPG. I had been told that mileage would increase, it did not. I Emailed K&N about it, I was told by K&N factory tech, they are NOT designed to increase mileage, they flow more air, and the computor will give the engine more fuel to compensate for the extra air and can get more power, but it is not desinged to increase mileage. Jim
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