Poor gas mileage, Very poor gas mileage (8 mpg to be exact)

[89celicagtliftback2]

I've got the 3S FE engine. It seems to run very well. Except for one minor detail. Im getting about 8-9 miles per gallon. Does anybody know what might be the problem? Has anybody had this happen to them? Will this be expensive to fix? Any response would be greatly appreciated.

[Deep]

Leaky gas tank?

[89celicagtliftback2]

HAHA. good suggestion. but no thats not the problem.

[brink]

Yeah, I'd think a leak somewhere, too. Did this start happening all of a sudden, or has it always done this? Also, how are you figuring the mileage? Are you sure you're dividing by the correct size gas tank?

If it's not a leak, then the gas has got to be going somewhere. To my mind that means out the exhaust, basically. So, it could be running too rich, could be a dead sparkplug (though I'd think you would notice that), could be a slipped timing belt, or something totally different. I'm just trying to deduce based on limited knowledge, though.

Do you have punks siphoning your gas at night? That would probably screw up your mileage.

[89celicagtliftback2]

my gas isnt leaking and you cant get to my gas taking without popping the latch from the inside (believe me i tried)i think it proboly has to do with my AFM. is that a common problem with a faulty AFM?