tambrico

So, usually I get pretty shitty gas mileage. I'm usually around 20 or so (city), but in these past few days it's dropped to the teens according to the display thingy. I don't think there's anything wrong with my car, because it runs fine. I've seen no loss in power. And I certainly do not drive like a jackass. So, any ideas? I think it's something wrong with the computer.

Tomtwtwtw

Could be any number of things...change in gas blends, lower tire pressues due to colder temps, plugs going, air filter clogging, breezy weather...

tambrico

Well, I can rule out most of those:

I always use 93 octane

Tire pressure is fine, my dad checked it yesterday

Brand new airfilter with my intake

I don't think my plugs would be going yest, since my car has only 4K miles

Would breezy weather really kill my gas mileage like that? It was a bit breezy these past few days, but not today when I hit the all time low.

jlong3382

What I think he means by "change in gas blends" is that the oil companies are going from their summer blend to their winter blend. I've also noticed a small decrease in mileage and I think that's what it is. My car has 9.5K.

That could also be the reason. A slighty dirty filter actually filters the air better than a brand new, clean, air filter.

tambrico

That makes sense, but will it give me 10.5mpg?

jlong3382

Wow...you are looking at you AVG MPG reading right?

cobaltinator

Yo I get better mpg out of my turbo diesel silverado with my car hauler behind it goin up a huge hill!!!!! Ouch......

tambrico

Yeah

jlong3382

Do you have a warrenty? If you do take it to your dealer. The factory warrenty is you friend. At least its my friend Until it runs out The worst thing they'll say is "could not duplicate concern" and then they'll give it back.

tambrico

Yeah, I do. Probably gonna have to bring it to the dealer.

WhiteSSBalt

Mines fallen all the way down to 25.2, but its b/c i've been doing nothing but city driving lately

jlong3382

"all the way down" I never break 23! but I do 98% city driving

Darkfuzion

iTrader: (1)

calm down you probably accidently reset it and the second u reset it u drove up a hill or mashed on it.

Projekt

ill tell ya exactyl why its doing that

your SRI intake is a big ass ******* cone and pipe

its getting colder outside.

see what im getting at?

id suggest taking it off for winter, i was noticing 14.0 L/100KM in winter, which is equivialt to high teens MPG.

tambrico

No, it was decreasing till it hit around 14.7, so I reset it, drove around for a while, and ended up with 10.5

No, I'm really not sure what you're getting at. It was 60 degrees today. What's wrong with the engine taking in cold air? Isn't that what a CAI is for?

Projekt

lol cold air compresses more, more air =more combustion=worse gas mileage because your creating more horsepower essentialy.

and you dont have a CAI you have a SRI intake.

jlong3382

Tambrico, How many miles are on your car? Have you every had your fuel system professionally cleaned? If you have REAL fuel injector blockage, The fuel injector cleaner you dump in your tank dosent do ****. My father has a '08 Saturn Outlook with 17K;his injectors got clogged cause of a tank of crappy fuel. He tried using the BG fuel system cleaner that you put in the tank (that stuff's $20 a can) No change. He took it to his dealer and they cleaned the fuel system using the BG machine; problem solved. It cost him $120 to have the dealer do the clean but it fixed it. Just a thought...

tambrico

But don't intakes generally improve gas mileage? Whether SRI or CAI. If the SRI is taking in cold air, then I'm pretty sure it's functioning as a CAI.

Ehh, I don't think so. My car has about 4.5k miles. I put on about 1k so far.

07cobalt4life

do it the old fashion way and double check for sure on the gas mileage

jlong3382

I'm a mechanical engineer; not for GM but the same design principles apply to almost anything. Engines "like" to run the way they were designed. You have an CIA and your engine wasnt designed to run with it therefore, you can expect to have some problems. Yes I know, the ECU is designed to adapt but, it can only adapt so much. In a nutshell, If you do any mechanical mods without redesigning the system your modding to accomidate for you mods, your eventually gonna have some mechanical problems related to you mods. ie: (in your case) sub normal efficency. Sorry man.

tambrico

I understand that, but why would that apply only to my car?

Also, the car has had a constant 20+ mpg for a month and a half after I put the intake on. It's just been these past few days.

Projekt

i dunno, i added a header/downpipe and my mileage got better :P

jlong3382

It applies to EVERYBODY and EVERY CAR on the road. I just used "you" because "you" are who im taking to right now. Sorry if the wording was pointed.

If you want to try to figure your problem out, its not going to do any of us any good to keep speculating. If I were you I would take the intake off, reset the meter, and go back to stock for 1 tank of gas, and see if your problem goes away. Test the theory and see if it valid. If its not, your back to square 1 but at least then you can go to your dealer and they won't give you any crap.

You increased your volumentric efficency. Efficency = (Output/Input)

brickerenator

Any chance you are letting your car idle in the mornings now that it's colder?