Originally Posted By: dbvettez061
Looking for extreme gas mileage with 09 Corolla...Would a k&n filter help in any way? From what i know, seems a regular filter flows as well as k&n.....
If you are looking extreme gas mileage, the answer is NO.
To achieve what you want, it is better to put those tornado fuel saver (aka Cyclone) or anything like that to choke your air intake. That device with extremely light foot on accelerator will give the best mileage, especially if the car comes with auto gearbox, however do not expect good acceleration power.