Miles per gallon gxp

**Alsafi92** · 01-09-2013

I dont know if anybody has ever had a problem with mpg. im curently avg. between 11-13 mpg . i took it to professional muffler because this all happen right after i got my new magnaflow exhaust on and they said it was the catalytic convertor and i just got that done yesterday and doesnt seem to be a big help atill getting only 13mpg. but first i took it to auto zone and they told me a 02 sensor but then prof. muffler told me the catalyic convertor. so someone help plzzzzz!!!!

**blueguy** · 01-09-2013

Did you change the o2 that was bad then?

**Alsafi92** · 01-09-2013

i didnt because they told me nothing was wrong with it. but i might just go get a 2nd look somewhere else

**blueguy** · 01-09-2013

If it pulled a code, something is wrong.

Go get the code read again and post it here.

And don't go "get a 2nd look elsewhere", just go to your local parts store and get the code read for free.

**DirtDog** · 01-09-2013

Well the 02 could definitely make the fuel economy go way down. It helps with fuel to air ratio somehow.

Edit: also if u haven't u could change spark plugs. The ls4's love the NGK TR6IX plugs. I have some ordered just waiting for them to come in for mine
Sent from my DROID RAZR using Tapatalk 2

**blueguy** · 01-09-2013

Originally Posted by marines542

Well the 02 could definitely make the fuel economy go way down. It helps with fuel to air ratio somehow.

Sent from my DROID RAZR using Tapatalk 2

Somehow....

By telling the motor what's going on in the exhaust?

Yeaaaaa.

**Alsafi92** · 01-09-2013

sounds good will do. thanks guys

**Alsafi92** · 01-09-2013

Originally Posted by marines542

Well the 02 could definitely make the fuel economy go way down. It helps with fuel to air ratio somehow.

Edit: also if u haven't u could change spark plugs. The ls4's love the NGK TR6IX plugs. I have some ordered just waiting for them to come in for mine
Sent from my DROID RAZR using Tapatalk 2

where did you order your plugs

**blueguy** · 01-09-2013

Google could tell you...but nooooooooooooooooo.

**Alsafi92** · 01-09-2013

and 8 of them?

**blueguy** · 01-09-2013

Originally Posted by Alsafi92

and 8 of them?

Ok, seriously?

**DanPrixGTP** · 01-09-2013

Nope, you need 1 spark plug.

Your GXP has the same engine as my Push Mower.

**Alsafi92** · 01-09-2013

jeez just a simple question dont need to get your undies in a bunch

**blueguy** · 01-09-2013

Google

Like I said.

Seems like you need to learn quite a bit about your platform.

**Alsafi92** · 01-09-2013

yeah i do. this is my first pontiac. i come from a sti and a eclipse... so a bit different.

**blueguy** · 01-09-2013

It's still a car.

It even says V8 on the trunk lid.

It's no different than your STi and Eclipse that needed 4 spark plugs because they are...SHABAM! Four cylinder engines.

**DirtDog** · 01-09-2013

I got mine from oreillys. They were cheaper than online by. 25 cents per plug.

Sent from my DROID RAZR using Tapatalk 2

**Alsafi92** · 01-09-2013

i know right after i typed that i thought to my self what a stupid question.... ):

**DirtDog** · 01-09-2013

Also the plugs I listed above are 1 heat range cooler than stock but over on gmls4 everyone says the engine runs better with em and less knock. I've researched plugs and wires a lot for em...and I also ordered msd wires. I have some links for info I'll send later when I get on computers

Sent from my DROID RAZR using Tapatalk 2