If you feel these products helped you, then that"s great, and telling others about your results is ok too.
BUT- Consumer Reports Magazine, a magazine put out by a non-profit group that tests all kinds of products and accepts no advertising money from anyone, has done very scientific tests on virtually all of the gas-saving gizmos out there, including the "Tornado" type air-swirler things and the "magnets on the gas line" deals. Their unbiased findings? None of these things help AT ALL, at least on any modern computer controlled fuel-injected vehicle.
The K&N filters, when clean, DO flow more air than a stock style paper filter. They do this because they don"t filter as good- they don"t trap the smaller particles! That"s probably ok if you only drive on clean paved streets with no dust or dirt.
On our dirt-track stock car engines, we went back to paper filters. After a race with a K&N, you could run your finger around the top of the carb venturies and there"d be a film of fine dust there. The paper filters eliminated this. A major race engine builder says he can immediately tell if a customer has run a K&N type filter when they bring their engines in for rebuilds- there will be MUCH more wear on the cylinder walls due to all the grit that gets by the filter. He strongly advises using only paper filters. However, the biggest reason in his mind is, during a 50 lap race on an average dirt track, the oil on the K&N filter attracts so much extra dirt(bigger particles) that by the end of the race the engine will be down by as much as 50 horsepower(we"re talking about an 800hp engine) compared to a dry paper filter due to the filter being clogged with dirt! He"s verified this on chassis dynos too.
How does this relate to the original topic of gas milage on your street vehicle? Simply that although when clean the K&N might flow more air than paper, it"ll get dirty LOTS faster and kill your mileage unless you stay on top of maintenance and clean that filter often. If ya do that, you"ll get better milage, at least until you cylinder walls and rings get worn enough to where the engine just can"t run as good. The best thing K&N has going for it is a super marketing program!
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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