gophins349

ok so i think the reason i am having bad gas mileage in my tib is because of my intake( AEM) is cut in half.

how and why it happened: a guy who had the car before me but the AEM CAI so he could put on the AEM bypass filter on. well ofter the bypass filter bit the dust(pretty much fell apart) i took it off and i just put the end filter on where the bypass was.(WAI) the filter sits right behind the radiaitor. i am going to put the rest of the piping on once the AEM dryflow filter i ordered comes in. my MPG is in the 20-25 city with the 1.8 ecu and a ground wire kit.

So can it really kill my MPG with the filter sitting where it is?

DTN

Well, warm air is less dense then cold air. I don't think that would matter all that much though. Burning more dense air burns more fuel. Your problem is probly maintenance item related. Check plugs, wires, pcv.

HyundaiKitCoupe

^ditto. Aem intake shouldn't cause that because the engine is using less power to perform. Change spark plugs to NGK iridium, PRD wires, get a new intake because same thing happened to me and I lost the other end of intake on the road.

25 mpg is normal for auto. Also do fuel injector cleaner and intake manifold cleaner.

gophins349

I have recenlty changed plugs and wires(PRD). there was no change in MPG. would the PCV really hurt mileage?

oh yea i have a 5 speed

Ericy321

What are your driving habits? The filter wont throw off mielage that bad. I would get your fuel system cleaned out professionally.

gophins349

i shift at 3000 rpm when normal driving. might take it as high as 5000 rpm if i get crazy with it. i put B12 in my tank about once a month. i have seafoamed my TB and IM. i also use Shell gas 93oct

Jason

You don't have to use 93 octane gas. 87 would be fine.

As for your mpg. Maybe clean your maf and iat sensors with electrical cleaner. might help.

SR Tech

I bet switching back to 87oct would bring your mileage back up, along with your wallet.

Ericy321

True, No reason for the 93. I would clean the MAF to.

And the B12 works somewhat. But to get the full cleaning the system needs to be run on only fuel injector cleaner through a machine.

HyundaiKitCoupe

how did you do your math? you should get an obd scantool so you can get some readings. old o2 sensors maybe lowering fuel economy too. it could also be your brakes/rotors/handbrake, engine mileage, wheel alignment, old struts, old tires...etc.

you could also save more gas by buying a fiberglass hood to take away 60 some pounds.