What kind of mileage *should* I be getting in my GTX in the city? Right now per the DIC Im getting 12.5, this is driving to work 7 miles one way, all city driving hitting no less than 7 stop lights and cruising at any given point for no longer than a mile at the very most. I have a brand new o2 sensor for what its worth. I dont drive it like its stolen, I try to baby as it as much as I can but nothing seems to help unless I hop on the highway at some point, which is not an option for my commute.

Anything I can do other than a tune to try and improve my mileage? The limited mods the car has are in the sig. I just cant believe these cars would get such crappy mileage in the city from the factory, and I have a free flowing exhaust which I would think would make it better if anything!

_________________
2008 Pontiac G8 GT - New Era intake and tune, 35w 5000k HID's, custom exhaust; 334whp/358lb.ft
13.05@107 1.98 60'

That's definitely a weird mileage. when was the last time you changed your plugs n so forth? In all honesty you "should" be getting close to 20mpg if not more. I do around 24mpg in the city driving in very similar conditions to what you described your trek to work as.

_________________
Peace, I'm outta here!

Check your tune.

I dont think I could get 12mpg in 7 miles if I tried lol.

_________________

http://WWW.AZGMPERFORMANCE.COM

i was getting 13 mpg in teh end

could be your fuel pressure regulator

_________________

YEAH, 12 is extremely low for a GP of any year or age. That's like full size Dodge Ram mileage or less.

_________________

2005 Fusion Orange GT2,, K&N CAI, BA Speakers, Kenwood DVD 8019, BT, Sirius, Ipod adapters, Overkilled

Tell me about it, its f*ckin killing me! Im thinking about trying some seafoam, checking the plugs (I thought they were new but cant remember what the kid told me), and having the tune checked. Just a matter of time and money, which I am low on at the moment thanks to my wifes need for new kitchen appliances lol

_________________
2008 Pontiac G8 GT - New Era intake and tune, 35w 5000k HID's, custom exhaust; 334whp/358lb.ft
13.05@107 1.98 60'

not true the 1964-1977's with the 455's where rated that low

_________________

92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

Errr, if I'm in stop-and-go traffic, I'm lucky to break 10 mpg. NORMAL city I pull off 18, and highway I get 35...go figure.

_________________
1968 Firebird 400: Lookin for 11s
1998 GTP: parting out - click here >> viewtopic.php?f=24&t=8093&p=129200" onclick="window.open(this.href);return false;
1995 GMC 3/4 ton: Beasty to haul the toys
1999 GMC Jimmy: her daily driver
1999 Firebird: Tinker w/that later

city (stop & go) i get like 17. city (not too much stop & go) like 19/20. highway like 24. i don't vary too much.

_________________
Everything needs more Corsa. No exceptions.

Follow my journey of flight at
http://alwaysastudentpilot.blogspot.com/

I get about 13 in the city with the Cutty. The highway gets me in the low 30's, though. Sounds like a tune up of both the engine and the PCM might be in order.

_________________
One Big Ass Mistake America

Seafoam it, change the oil, change the plugs and wires, clean TB and MAF, clean air filter, change fuel filter, change the tstat, flush the coolant, and run some fuel injector cleaner through. If you still get bad mileage after all that, then get your car tuned. If your car gets bad mileage after that, something is FUBAR.

_________________

I get between 15-17 mpg in the city. I am getting a little less now that I put in my stock intake.

_________________
1999 GT|SLP CAI|Borla Catback| Shift kit|18" Koblenz|GMPP Lowering|GMPP handling|Blk Headlights|ER Rcokers|HV3|HV TB http://www.fquick.com/The_Guz

I can do 12 city. My foot gets REALLY heavy lol...

_________________

2012 Ford Focus SE Sport
2012 MINI Cooper Clubman

I have ADHD and drive a Focus. Ironically.
Although gold dust is precious, when it gets in your eyes, it obstructs your vision.

What I dont get about the tune thing, is that I have a stock PCM in there from a freakin Regal. I know I should get it tuned for better performance and mileage anyways, but I dont know how that could be a culprit. The car runs great, nice and strong, only thing I can notice is a slight cutout on the 1-2 shift at WOT, but other than that the scans indicate all is well. Maybe I'll rescan it again with some around town driving to see if theres anything I can figure out :-/

_________________
2008 Pontiac G8 GT - New Era intake and tune, 35w 5000k HID's, custom exhaust; 334whp/358lb.ft
13.05@107 1.98 60'

dead weight kills gas mileage. clean out your car, remove everything you dont need. that includes the 7 dead hookers in thr trunk.

then change your o2 sensors.

_________________

'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

^^^ keep your rpm's under 2 grand

check what your rpm is at 55 that is supposed to be teh most efficient rpm

try and keep it in that range

i went from 10.5 to 11.5 w/ just that

_________________

you lie my car gets better when i do 74 mph 33 mpg vs. 29 mpg (both flat roads)

_________________

92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

i get better mileage w/ a ton in teh bed

w/ a pallet in the bed i got 14 mpg my normal way home
w/o and normal way home 10.8 ...

_________________

Im not going to lie... Im getting around the same if not worse in the city... I can actually watch the guage go down light after light.

_________________

OVERKILL
P4 Perilli Tires
ZZP Pacesetter Headers
Custom Cold Air
ALT 104
3.5MPS Pulley

Yeah, pretty much. I love the sound of a blower. Wish it was screamin' now!

_________________
One Big Ass Mistake America

One thing that I noticed when I got my car tuned.. Looking at one of the tables, I was SHOCKED. There is so much more fuel economy to be had.

_________________
Everything needs more Corsa. No exceptions.

Follow my journey of flight at
http://alwaysastudentpilot.blogspot.com/

Adding timing will improve economy as well. I run 45* on the highway.

_________________
One Big Ass Mistake America

me to I get right about 10 miles to the gallon. But im looking to fix that by one slowing the hell down. i drive 5-7 over speed limit no matter were im at. Also I think im in a need of a good tune up.

_________________
Its Mr hear me befor you see me.
Im KING KONG!!!!!!!


"Why go slow when you can go fast?"

Sounds like you might have a bad Engine Coolant Temp Sensor; over time they get gunked up with antifreeze (like the Low Coolant sensor in the radiator), which insulates the sensor, and can give you poor mileage. Autozone sells them for around $13(TU178). I'd replace it along with the thermostat, especially with colder weather on the way.

mine ive had it for a bit more than a year now and i dont remember ever checking it lol and im not welling too, i just check the needle and go fill up if i need it! I know the way i drive and how bad i can make it, lets say i can drive it any where as bad as 175KM to 350KM out of a full tank (175KM's out of a full tank was a record for me )

_________________
Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....