Pulling the K&N cold air intake topic from another thread - Does anyone have experience with one of these devices improving gas mileage and/or power? K&N lists a 9 horsepower gain at 4847rpms on their website at http://www.knfilters.com/search/product.aspx?Prod=57-9024 and http://www.kandn.com/dynocharts/57-9024.jpg . My goal is the improve my mileage from around 17mpg to maybe 19-20 highway on my 98 T100 3.4L 4x4. The cost is around $250 for the CAI so I please help me determine is this is wise or wasteful. Thanks.