Thread: Horrible gas mileage for my 06 GXP

So I just wanted to see if this is common or if there is something that I can do to improve my gas mileage.

102,000 miles, Averaging 14 mpg easy driving around town. No traffic just surface streets, Car reads 50 miles left in the tank and I am at 190 miles since fill up so if that is accurate, I will get maybe 240 out of the tank which seems very low.

I still only fill up once every 2 weeks since I live close to work and everything else, but this sitll sucks and i would love to get the 18-19 city that i am supposed to be getting.


Any help??

Sadly, it's a 5.3 V8.

DOD doesn't help in the city.

You could do pcv, fuel filter, new o2's, seafoam it, change fluids/new plugs, proper tire pressure, and some flow mods might help the MPG's...but they don't really do that great on gas anyways.

yeah i average about 16mpg, so dont feel bad about yours.

Originally Posted by blueguy91

Sadly, it's a 5.3 V8.

DOD doesn't help in the city.

You could do pcv, fuel filter, new o2's, seafoam it, change fluids/new plugs, proper tire pressure, and some flow mods might help the MPG's...but they don't really do that great on gas anyways.

ehh...ok. Well at least it isnt something wrong with the car. I hate that DOD. I think i will have my local tuner shut it off. Thanks for your help!

Originally Posted by Jteske88

yeah i average about 16mpg, so dont feel bad about yours.

Ok thats good to know....I have tried to baby it to get it over 14mpg and actually did for a few days...

not gonna happen, unless your doing over 55

Originally Posted by Jteske88

not gonna happen, unless your doing over 55

So im just curious then....when did GM actually get the 18-19mpg city that they stated? I dont get it lol. I mean, I understand that my car has 102,000 miles on it, so I dont expect it to get that, but i was hoping for at least more than 13.7 lol.

They prolly just took a median reading of city and highway

They likely consider city driving to be more than a 5-10 minute drive.

I only get 14-16 mpgs right now in my GTP, I do 5-6 miles a day round trip for work.

Originally Posted by Fivefingerdeathpunch

They likely consider city driving to be more than a 5-10 minute drive.

I only get 14-16 mpgs right now in my GTP, I do 5-6 miles a day round trip for work.

Yeah thats about what I am doing....

Originally Posted by rguy200073

Yeah thats about what I am doing....

And you got two more cylinders.

Don't feel so bad now...dontcha

Running 91+ octane though, right?

im running 93 octane never ran anything else. mpg never really have changed since i purchased the car. but i do like to watch the instant jump way up sometimes lol

Originally Posted by blueguy91

Sadly, it's a 5.3 V8.

DOD doesn't help in the city.

You could do pcv, fuel filter, new o2's, seafoam it, change fluids/new plugs, proper tire pressure, and some flow mods might help the MPG's...but they don't really do that great on gas anyways.

^^^^ what he said helps. I average about 20 in the city and base traffic is a 1000 times worse than city traffic. I usually get 310 moles per tank and around 35 avg on the highway. Also when I did fuel filter I noticed difference. But that's bout all u can do

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Originally Posted by blueguy91

And you got two more cylinders.

Don't feel so bad now...dontcha

Running 91+ octane though, right?

Well I was but did go to 87. Didnt think it would make a difference since it is stock. But.....I just filled up with 91. I miss the 93 octane on the east cost. Was so surprised to see that Arizona doesnt have anything over 91 except for racing fuel.

Originally Posted by tc300

Make sure you run the high octane!! I have a 00' GT stock.. When I use low octane by the end of month I have dropped from 22-24 ish all the way down to low 18's. I have a wally world credit card I use to get gas on so I save 15 cents off ea gallon... :-)

Still kind of blows my mind how much of a difference it makes...... ???

Yeah I will keep it at 91 from now on.

Originally Posted by marines542

^^^^ what he said helps. I average about 20 in the city and base traffic is a 1000 times worse than city traffic. I usually get 310 moles per tank and around 35 avg on the highway. Also when I did fuel filter I noticed difference. But that's bout all u can do

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310 per tank? DAMN! I can only hope for that kind of mileage in my wildest wet dream....

Well I got 298 on a take this week driving from north Carolina to Tennessee. City I usually don't do that good but that's the city

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Hmmm that's still a lot lower than mine says average driving in city traffic around here

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