Definitely avoid the reusable K&N like the plague if you are looking for good mileage. The oil on the filter media comes off and fouls your MAF resulting in lower gas mileage. I saw a drop of 2-3 mpg over a one month period. Put in a disposal filter, cleaned the MAF with CRC MAF cleaner and mileage came back immediately. Just my personal experience but it's widely posted by others.