Thread: Gas mileage

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  1. #1 Gas mileage 
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    To me it seems that I am not getting very good has mileage, in city I am getting 14 to 16 and for my normal highway driving I get 17 to 19 but if I take a road trip I will get 25. I am not sure if this is normal or not any suggestions would help. I also put 93 octane if that matters.
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  2. #2 Re: Gas mileage 
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    Quote Originally Posted by Zyrebel View Post
    To me it seems that I am not getting very good has mileage, in city I am getting 14 to 16 and for my normal highway driving I get 17 to 19 but if I take a road trip I will get 25. I am not sure if this is normal or not any suggestions would help. I also put 93 octane if that matters.
    That is normal if you want so improvements on gas mileage change the way how you drive. But i just look for autoparts that could help me increase my mileage and i figured out K&N air filter can add additional mileage also bosch spark plugs. So far that is what i know FOR NOW i always keep research for quality autoparts.
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  3. #3 Re: Gas mileage 
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    Yea I already have a K&N air filter and just replaced my spark plugs 5000 miles on them.
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  4. #4 Re: Gas mileage 
    GrandPrix Junkie redlinepontiac's Avatar
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    stay off boost if possible
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  5. #5 Re: Gas mileage 
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    Quote Originally Posted by redlinepontiac View Post
    stay off boost if possible
    this is in the n/a section
    Last edited by blueguy; 12-11-2010 at 11:57 AM.
    '00 GT- nothing special
    My only advice: Don't take my advice

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  6. #6 Re: Gas mileage 
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    Yea I was about to say my car is a gt not a gtp.
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  7. #7 Re: Gas mileage 
    SE Level Member stlunatics2oo3's Avatar
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    its normal my GT gets the same milaege. its in the gearing its like a 3:69 or something. you get alright city but highway you get 25-29 depending on load and other factors.
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  8. #8 Re: Gas mileage 
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    My last tank was about 17 w/city driving and 5-10 min of warm up time as it is getting really cold here in MN. High of 0* F Sunday and -15* F Monday morning.

    In the spring, on the freeway cruising at 65-70, I can get close to 30 if I have the air off and there are no hills.

    BUT, and I mean BUT, I am driving 75-80 on the same freeway with the air on, my mileage will plunge to 24 or so.

    I am bone stock n/a @ 121,000 miles. I seamfoam each fall by puting 1/3 to 1/2 can through the brake booster and the rest in the gas tank.
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  9. #9 Re: Gas mileage 
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    I've had tanks where I average 13 combined, and tanks where I get 25 combined. I usually drive to the same places every week, and the same style. I open it up here and there but I dont floor it from every light...I honestly notice my gas lasts longer when I use 89 instead of 87. Not kidding. The station down the street from me charges the same for both, so of course I get the 89, but if I'm out somewhere else and have to put the 87 in I feel like the tank goes quicker. Car doesn't run any different but I just feel like it drinks it faster. Call me crazy
    2006 GT- S1x, 3.25 MPS, Lucas 42.5, MAF, SD Headers, C5 Brakes, AGX/Vogtland, GMPP sways
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  10. #10 Re: Gas mileage 
    I live here. SlowNA06's Avatar
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    Long highway trips should get you 28-30 mpg, unless you drive like a dick.

    I'd say you need stock spark plugs at stock gap (you did properly gap your plugs, right?), a cleaned MAF sensor, cleaned throttlebody, new fuel filter, and properly inflated tires. Do all of these things and see if your mileage changes.

    If you're looking to throw a little more money at it, a custom or even shelf tune should get an extra mile or two out of each gallon.
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  11. #11 Re: Gas mileage 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    maybe get a new o2 sensor aswell

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  12. #12 Re: Gas mileage 
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    Quote Originally Posted by andreasue View Post
    That is normal if you want so improvements on gas mileage change the way how you drive. But i just look for autoparts that could help me increase my mileage and i figured out K&N air filter can add additional mileage also bosch spark plugs. So far that is what i know FOR NOW i always keep research for quality autoparts.
    Bosch plugs are fail...

    OP

    You want to do a tune up, new fuel filter, air filter, plugs and wires.

    Quote Originally Posted by Fivefingerdeathpunch View Post
    maybe get a new o2 sensor aswell
    This too.
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  13. #13 Re: Gas mileage 
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    Everyone keeps bashing Bosch plugs.

    I understand the point of the Pt plugs - to prevent tip erosion. I also understand that they don't make as big of a spark as copper plugs.

    That being said - I've had Bosch's in lots of cars without a single issue. Moreover, the only plug I ever HAD to replace was the Cu Champions I put in my GTP last summer.

    Maybe I'm the exception to the rule but I have nothing bad to say about their plugs.
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  14. #14 Re: Gas mileage 
    GrandPrix Junkie The Guz's Avatar
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    My gas mileage is comparable to yours. I average 16-17 in the city and about 25 on the highway. One question, why are you running 93 when a GT requires 87?
    1999 GP GT 18" Boss 353 Concave|SLP CAI|Borla Cat Back|Plog|HV3|HV TB|ER Rockers|Custom Retrofit Projectors|GMPP Lowering|GMPP Handling|MPD F1|Full Diode Dynamic LEDs
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  15. #15 Re: Gas mileage 
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    Quote Originally Posted by Madness View Post
    My last tank was about 17 w/city driving and 5-10 min of warm up time as it is getting really cold here in MN. High of 0* F Sunday and -15* F Monday morning.

    In the spring, on the freeway cruising at 65-70, I can get close to 30 if I have the air off and there are no hills.

    BUT, and I mean BUT, I am driving 75-80 on the same freeway with the air on, my mileage will plunge to 24 or so.

    I am bone stock n/a @ 121,000 miles. I seamfoam each fall by puting 1/3 to 1/2 can through the brake booster and the rest in the gas tank.
    not to jack but how do you get that much in the brake booster line??
    when i did it, it would rev up and run crazy and it was SOOO slow and i didn't make it very far. so either im impatient or something was wrong.

    and i'm getting about 17-18 in the city on my stock GT. on road trips i get 25 though. so i guess its normal...
    2003 Grand Prix GTP-3.5 setup, sold it, miss it
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  16. #16 Re: Gas mileage 
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    the hose should fit perfectly on the bottle.
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  17. #17 Re: Gas mileage 
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    you are about normal on the fuel mileage. If you haven't changed your o2 sensors like others have said, I would go a head and replace those. I wouldn't use 93 octane either because you are just throwing extra money away. Your car should run just fine on 87 or 89. Also city driving can tend be harsh on anyone's fuel mileage because its stop n go most of the time. Freeway driving you'll notice your fuel mileage climb and if you use cruise control you should be getting around 30 mpg or so.
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  18. #18 Re: Gas mileage 
    I live here. SlowNA06's Avatar
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    Quote Originally Posted by ramairgt2 View Post
    if you use cruise control you should be getting around 30 mpg or so.
    ...Wisconsin doesn't have hills? Cruise control gets worse mileage than your foot. Unless your foot's retarded.
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  19. #19 Re: Gas mileage 
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    Going to say I agree with your foot yielding better mileage than cruise control, unless you really don't know what you are doing.
    2001 Pontiac Grand Prix GT : Stock and slow and SOLD.
    2001 Pontiac Grand Prix GTP Special Edition
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  20. #20 Re: Gas mileage 
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    as soon as it got cold up here in ND i would do the math and would be getting 10-15 mpg with a 5 min warm up time
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