[sarguy01]

Overly simplified, on most fuel injected engines, if there is less air flowing in, there is less gas going in. Sticking with overly simplified thinking, gas mileage should stay the same with a clean or dirty filter. So, more fuel is used with a clean filter, but less pedal is used to keep going a certain speed. A dirty filter will cause you to use less fuel, but more pedal to stay at a certain speed. Again, overly simplified but I can see why there would/should be no difference in fuel consumption with a clean or dirty filter.

K&N vs. paper. This has been debated on all different auto forums and nobody has ever proven to me beyond a doubt there is one filter that dominates all others. It all comes down to personal preference. I kept my K&N's clean and had oil samples of my truck tested and it showed that the K&N filtered just as well as a paper. Some people may have different results.