Crappy Mileage

[CCobraW]

My car has consistently crappy mileage, like 10-12 mpg, even if I'm driving like my grandma did. just about everything I can think to do, I've done.
New fuel filter, plugs, wires, cleaned MAF, new TPS, new IAC, cleaned air filter, new PCV.

Any other ideas on what it might be? Only mods are the ones list in my sig.

 

[CC'S95GT]

clogged cats? How many miles are on your current ones?

 

[CC'S95GT]

I just saw in you sig you have o/r x.

 

[ProKiller]

is the CE light on? did you get a tune to turn off the CE after the o/r x or do you have MILs?

 

[CCobraW]

I had a tune loaded, by the shop that did the IMRC deletes and they turned the cats off in the tune.

 

[99GreenStang]

I would check your injectors and make sure you dont have one thats bad . Try some Berrymans Chemtool it cleans injectors and gas treatment it works very well and actually does what it says and is affordable can be picked up at auto parts store or walmart for a couple bucks . If you dont have emissions just cut cats off straight pipe put a bung in it and get MIL eliminators and problem solved there .

 

[BigBore96]

I'm sorry guys but an o/r X is not going to be his problem, code or not. It's just not going to happen. Having an IMRC code throw is not going to destroy gas mileage like that either.

I would look for a stuck injector, leaking fuel (it happens), I'd go ahead and pull the codes even if no light is on.
How does the car feel when you drive it? Any unusual smells, exhaust color or anything?