[ob_1jr]

Well, from my experience, the cold air box made no difference in mileage. Neither did the 4" turbo back exhaust (the offroad system). One thing that did make a little difference was running the predator tuner. I picked up about 1-2 mpg. Granted, possibly if I could keep my foot out of it, I might have seen a little more increase from the other mods, but what is the fun in that? The k&n drop in will flow just as well as any cold air intake. Personally, I do not like the k&n since the time I pulled it out to check it and held it up to the light......you could see pinholes all throughout. In my experience though, it doesn't really matter how I drive my truck it gets pretty close to the same mileage. I know something that will help is to keep the rpms below 2000 when driving and the mileage should increase some.