Reduced gas mileage w/K&N CAI

[Liljon]

Ever since I installed my K&N CAI I've notieced reduced gas mileage. I'm over the point where I have to tach it out so I can hear that beutiful SC sound, and it still seems like I'm getting worse gas mileage. Anyone else notice this with the K&N CAI?

[pclear9061]

you must have some type of blockage somewhere or somthing, everyone that i read of said that they could hear it fine and (that i know of) didnt have that much different of gas mileage. the other thing is have you changed your driving habbits, especially if you tach it out all the time.

[ArrivalBlueSS]

Plus fuel mixtures change with the seasons so you will see slight changes in gas milage based on a variety of things. Do you have your A/C on all the time cause it's hot out, stuff like that.

How much difference are you talking about?

[BlackRedline04]

thats funny, my gas mileage has improved since I installed the K&N intake...

[Blue04RedLine]

Mine was comparitively low to begin with, but I do all city driving most of the time. I haven't noticed and significant decrease at all after the intake, maybe at most .5 miles/gallon. But I also have my air on full blast almost all the time now, being it's 95 with 90+% humidity.

[JDNav]

I just installed one myself. I did't think my check engine light should've come on but it did. Is this common?

[Kevinedwards05]

The check engine light may come on if the maf sensor picks up too much oil due to the filter change. Clean your maf sensor or replace it. I have just ordered the K&N, and expect it anyday now. I have experienced a decrease in mileage over the last week, but I attribute it to extremely high humidity and temperatures, as well as my driving habits. I am only getting about 245 miles to a tank, whereas I was getting 285. Once the humidity drops, you should see a change. Check the filter and duct that you installed as well. Like the man said, if you have a blockage, it will act just like a choke, and throw you into a rich run. That will suck some fuel, although I would think that the CEL would come on in that case.

[JDNav]

Thanks, I'll try cleaning the MAF sensor and report back as to what happened.

[wolfie]

I noticed a big increase in gas mileage after installing the K&N CAI.......

[Sp00ner]

It shouldn't really do anything to your mileage. I stress shouldn't. If anything, you should get a small decrease in mileage under hard throttle. Since you're hoping the K&N is moving a little more air in. If so, the engine is using a little more gas...