Thread: Getting horrible gas mileage 11 mpg....po420 code

I have a 2001 Grand prix gt 99,000 miles. I'm going by the mpg on the dash info center. I have gotten to around 17mpg in the summer (po420 code was present then also)..but now I get around 11-12 mpg. I know its cold outside now but still.

I'm looking to order a cat and down pipe from zzp..not sure if its 2 or 3 inch though.

Also will be doing a tune up asap...Not sure how much that code can affect gas mileage but I have to try something.

Originally Posted by REDCOMPG

^ Spark plug fouler trick? Or have your PCM tuned.

Yeah I was told with the zzp cat, that would most likely have to be done..

Originally Posted by Fivefingerdeathpunch

Or just a buy a quailty cat and not deal with the bull**** sounds like a way way better idea to me.

But its just that too many people are cheap asses.

I'm not totally against buying a more expensive cat, just reading around and a lot of people were going with the zzp cat, I guess for more performance reasons. Which is cool but I see that the code will probably still be present. I just need to get it taken care of, wasting gas at its price, is not cool.

@REDCOMPG Yeah your write I'm going to order one and see what happens.

That's true the follower trick you mean simulator?

Also its a 2.5 downpipe.....

Originally Posted by redcompg

unless you know you want to spend more money if that's the case ill give you my paypal and you can send me the difference and ill put it towards hookers and blow 8)

Party with Red.

Originally Posted by REDCOMPG

Unless you know you want to spend more money if that's the case ill give you my Paypal and you can send me the difference and ill put it towards hookers and blow 8)

Hahahaha, Ill keep you in mind.. I Just read the post in the link you provided..very clever idea..thanks a bunch.