I don;t know if it's a coincidence, but my MPG have improved quite a bit in City driving. However, this could also have been cause by less frequent short trips. I no longer drive the van to work -- which was a 6 mile commute. Currently, our average trips on town are aournd 15 miles. Anyway, b4 K&N, I was averaging 17 MPG. After K&N, the 4 tanks were as follows: 20, 17 (very cold and a lot of idling), 19, 19. My stock filter was pretty dirty after 20K miles. | 
