Originally Posted by kam327
NO WAY does dropping in a K&N filter get you a 5 mpg gain. I've put in K&N's in several cars and never realized any economy gain. Even K&N is smart enough to not make any fuel economy claims in their marketing.
K&N: "A lot of exaggerated claims are made in the marketplace by products claiming to improve gas mileage. K&N makes no general fuel economy claims, however we encourage you to try our air filter for yourself. Keeping air filter restriction as low as possible can be an important tool, among others, for maintaining high mileage."
I'm not kidding. My average mpg now is 33, and I'm rounding half a tank with barely any city. I hop on the highway for litterally two off ramps, and I exit. They may not claim a mpg increase, but the people and myself claim a nice gain.