Anyone have any ideas or suggestions for better mileage improvements. It seems like I'm getting very poor gas mileage (I estimate around 22-24 mpg highway). I have the K&N panel but have not installed since I heard someone here said the oil can damage the MAF sensor. How about that Tornado gadget? Does that thing really work? Will replacing the fuel filter help any? The manual says replace at 105K miles but my car only has 63K miles.