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Miles per gallon gxp

A

Alsafi92

New member
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!!!!
 


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.
 
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
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marines542 said:
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
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Click to expand...

where did you order your plugs
 


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.
 


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

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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

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