so far I can't say I've noticed a big change in mileage, its really hard for me to gauge though because I'm in Oregon and no 2 gas attendants fill it the same so consistency is out the window. It seems like I've gained 1-2mpg in town such that I'm getting 25-27 instead of 25 solid. Like I said though its hard to judge, I wanna get a road trip on it to really tell. I didn't notice a big difference in performance either. Worth it? Yeah in the sense you don't have to ever replace it and only clean it. It pays for itself on that merit alone, mileage is a bonus.
