i'm usually tickiling 410 on average from my 2.5i...if i drive uber conservitavely haha. the CAI and the catback doen't help in the MPG department. I did notice something interesting though; because of all the torque it puts out i see very little change in mpg when i have my self, my friend, 2 50+lb dh bikes, and another 100 lbs of gear in the car. most of my other friends with 4 banger cars expeierience terrible mpgs under the same conditions.