Just thought everyone would like to know, seeing as how everyone wants to know about gas mileage on their RL's. I jumped from about 23 mpg to 25.5 mpg since adding the K&N cai. That's about 1/2 city and 1/2 highway, with taking it a little easy. I still hit the gas hard a bunch of times and ran it up in speed a few times, though. I found that when I was driving it really hard over the past few tanks my mileage never got worse than 23.