Thread: Better Gas Mileage?

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  1. #1 Re: Better Gas Mileage? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Quote Originally Posted by 99PontiacGTP View Post
    Not sure why mine is not 17-18 gallons. From E, it takes around 13 gallons to fill up.... and that is fillng it after several "clicks" off.
    Your fuel gauge is wrong then.

    Your tank is just as big as mine. 17 gallons.

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  2. #2 Re: Better Gas Mileage? 
    Killa Bee Scottydoggs's Avatar
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    Quote Originally Posted by 99PontiacGTP View Post
    Not sure why mine is not 17-18 gallons. From E, it takes around 13 gallons to fill up.... and that is fillng it after several "clicks" off.
    all gauges are a bit different car to car. but also keep this in mind, when the low fuel light comes on, you should have 100 miles of travel left in the tank, so there's 3 or 4 gallons right there in the bottom of the tank.

    ive also noticed in my regal it only takes 13 to 14 gallons to fill it up from E.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: Better Gas Mileage? 
    GT Level Member Adidasdude1989's Avatar
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    Maybe different sub models the tank size is different? Possible?

    Miles: 170-XXX
    Engine: 3.8L V6
    http://youtube.com/KBsVlog

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  4. #4 Re: Better Gas Mileage? 
    Killa Bee Scottydoggs's Avatar
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    Quote Originally Posted by Adidasdude1989 View Post
    Maybe different sub models the tank size is different? Possible?
    Quote Originally Posted by scottydoggs View Post
    all gauges are a bit different car to car. but also keep this in mind, when the low fuel light comes on, you should have 100 miles of travel left in the tank, so there's 3 or 4 gallons right there in the bottom of the tank.

    ive also noticed in my regal it only takes 13 to 14 gallons to fill it up from E.
    i thought i just cleared this up.

    every car has a reserve of 100 miles in the tank when the light comes on, thus leaving at least 3 to 4 gallons in the tank when the light comes on. 4 + 13 = 17 last time i checked. we all have a 17 gallon tank. plus the fuel lines and filler neck.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #5 Re: Better Gas Mileage? 
    Moderator dsmuts's Avatar
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    Quote Originally Posted by scottydoggs View Post
    every car has a reserve of 100 miles in the tank when the light comes on, thus leaving at least 3 to 4 gallons in the tank when the light comes on.
    Just to be clear not every car is that way but the grand prix's are.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  6. #6 Re: Better Gas Mileage? 
    GT Level Member Adidasdude1989's Avatar
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    Quote Originally Posted by 99PontiacGTP View Post
    Not sure why mine is not 17-18 gallons. From E, it takes around 13 gallons to fill up.... and that is fillng it after several "clicks" off.
    Yes mine is 13 gallons from E, it always has been.

    Miles: 170-XXX
    Engine: 3.8L V6
    http://youtube.com/KBsVlog

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  7. #7 Re: Better Gas Mileage? 
    GTX Level Member dbextreme's Avatar
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    Every fill up (I always go from full to amost empty) is anywhere from 14.7 - 15.2 gallons on fill up... That's ~ 16.5 MPG
    1999 GPGT - L26, Ported Top Swap, XP Cam, 3.2 MPS, 42.5#, N*, LQ4, SD Headers, Double Roller, TEP Race Trans w/Stand alone Cooler, Precision Industries 3000RPM Stall, 75 Shot Nitrous Express Proton Kit w/Purge, 3" Dual Borla Pro XS, Corsa Dual 3.5 Tips, 5% Tint
    1995 Firebird Formula - Under the Knife
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  8. #8  
    GT Level Member iRideGTP's Avatar
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    according to my DIC i also only get 17 average mpg which really sucks. tb and maf cleaning is on the to-do list for sure
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  9. #9 Re: Better Gas Mileage? 
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    17-19 mpg city is all these things are rated for. Hit traffic, expect 14 mpg or less.

    27-30 mpg requires freeway and careful driving, as in no accelerating to pass people and other nonsense like traffic.
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  10. #10 Re: Better Gas Mileage? 
    Sunroof S/C'es air 2 face E IN v Y's Avatar
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    lol at what this thread has become.
    I get 25 MPGs... and i drive it like i stole it.
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  11. #11 Re: Better Gas Mileage? 
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    Quote Originally Posted by E IN v Y View Post
    lol at what this thread has become.
    I get 25 MPGs... and i drive it like i stole it.
    Thats impossible.

    But continue to amaze us with stories of your brochampionship.
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  12. #12 Re: Better Gas Mileage? 
    Sunroof S/C'es air 2 face E IN v Y's Avatar
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    I can prove it.
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  13. #13 Re: Better Gas Mileage? 
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    25 mpg or that you go wot every time you touch the gas?

    seriously had it with GP owners claiming they're "hard on their cars" then get amazing fuel economy.

    Just doesn't happen.
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  14. #14 Re: Better Gas Mileage? 
    Sunroof S/C'es air 2 face E IN v Y's Avatar
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    Well my DIC is wrong then i guess.
    You win Matt.
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  15. #15 Re: Better Gas Mileage? 
    GrandPrix Junkie Sandman's Avatar
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    Damn I feel bad. I get a little better than 200 miles a tank city and 350 on the highway. I am running slightly shorter tires and cooler tstat. I'm about to swap back to a stock Tatar and correct size tires. I used to pull 30+ on the highway, now I'm around 27 the last time I was on the highway.
    05 Saab 9-2X Linear (Saabaru)
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    Quote Originally Posted by TLSheff View Post
    You said "I'm done with it"... car says "Oh, really? *trollface*"
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  16. #16 Re: Better Gas Mileage? 
    GTX Level Member dbextreme's Avatar
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    Let me know if that Tatar helps and where you pick one up.. I might need to get one myself..
    1999 GPGT - L26, Ported Top Swap, XP Cam, 3.2 MPS, 42.5#, N*, LQ4, SD Headers, Double Roller, TEP Race Trans w/Stand alone Cooler, Precision Industries 3000RPM Stall, 75 Shot Nitrous Express Proton Kit w/Purge, 3" Dual Borla Pro XS, Corsa Dual 3.5 Tips, 5% Tint
    1995 Firebird Formula - Under the Knife
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  17. #17 Re: Better Gas Mileage? 
    GrandPrix Junkie Sandman's Avatar
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    It'll help some I'm sure, the little stuff I've done to take my MPGs down add up so I'll do some stuff to bring it back. Plugs and fuel filter as well.
    05 Saab 9-2X Linear (Saabaru)
    77 Morris Garage B
    Quote Originally Posted by TLSheff View Post
    You said "I'm done with it"... car says "Oh, really? *trollface*"
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  18. #18 Re: Better Gas Mileage? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    You have a 17 gallon tank, read your owners manual lol.

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  19. #19 Re: Better Gas Mileage? 
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    Quote Originally Posted by Fivefingerdeathpunch View Post
    You have a 17 gallon tank, read your owners manual lol.
    I thought our tanks were 18 gallons.
    1997 Red GTP 182000 miles stock
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  20. #20  
    SE Level Member silvapain's Avatar
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    It's 17.5 gallons according to my 2002 manual, page 6-74.

    Left to right, top to bottom guys.


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