Thread: gas mileage

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  1. #241 Re: gas mileage 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    I get better mpg on the freeway without using CC.

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  2. #242 Re: gas mileage 
    Killa Bee Scottydoggs's Avatar
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    im in the 10 to 14 mpg club as well for city driving.

    on the open road doing 75 i can get 30+ if i hit no hills.

    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. #243 Re: gas mileage 
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    Quote Originally Posted by Fivefingerdeathpunch View Post
    I get better mpg on the freeway without using CC.
    I dont think that even would make sense unless you're in a super hilly highway or something.
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  4. #244 Re: gas mileage 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Think of it this way.

    CC tries to keep you at the same speed all the time, so its always getting on the gas and off the gas, though you hardly notice it. With CC doing that its really reducing your MPG by a small amount, it can vary from 1-3 mpgs (just a good guess). And if hills are involved the CC will downshift the car to increase the speed back up to where you set it and then drop back into overdrive and continue on.

    As where if I'm not using CC I can keep my foot on the pedal and not move it and not be on the gas and off the gas like CC would. And when hills come, I can keep my foot planted and only lose a few MPH and not have the car downshift to use more fuel, then when the road becomes flat again I will be right back up to my speed slowly.

    Yes its not the best explanation, buts its pretty much true.

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  5. #245 Re: gas mileage 
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    Yeah like i said unless its hilly lol. My highways at least arent too hilly so CC is best for me.
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  6. #246 Re: gas mileage 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Even if there are not many hills or slight upgrades, I still get better mpg not using CC.

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  7. #247 Re: gas mileage 
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    Interesting
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  8. #248 Re: gas mileage 
    SE Level Member 99FormulaM6r's Avatar
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    Usually average between 23.5-24.5 on average driving, if I'm doing more highway driving it's 25+. The car has it's share of issues that popped up after I bought it this January, but the fuel economy has been pretty good. Granted, the car it replaced was a 1990 Oldsmobile 88 with a pre-series 1 3800 and it got about the same (with almost 140k miles on it).

    Kind of funny, also, that my LS1 Firebird averages about 23 or so, but gets closer to 28 mpg's on the highway. I wish I had an LS1 in my GP
    1999 Pontiac Firebird Formula M6: SLP lid, LS6 intake, GMMG catback, MGW, blanks/HPS/SS lines, Koni 4/4, Strano 35/22 sway bars, UMI PHB
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  9. #249 Re: gas mileage 
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    on a good week or 2 i get 22-23 on a bad week 19. i recently got about 350 miles to the tank.
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  10. #250 Re: gas mileage 
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    addition to my last post. i get atleast 27 highway so really it just depends on how much city driving i do. i drive with a very light foot
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  11. #251 Re: gas mileage 
    GTP Level Member Oxfire's Avatar
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    19 city/highway mixed. Guzzlin' gas.
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  12. #252 Re: gas mileage 
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    Quote Originally Posted by Fivefingerdeathpunch View Post
    Think of it this way.

    CC tries to keep you at the same speed all the time, so its always getting on the gas and off the gas, though you hardly notice it. With CC doing that its really reducing your MPG by a small amount, it can vary from 1-3 mpgs (just a good guess). And if hills are involved the CC will downshift the car to increase the speed back up to where you set it and then drop back into overdrive and continue on.

    As where if I'm not using CC I can keep my foot on the pedal and not move it and not be on the gas and off the gas like CC would. And when hills come, I can keep my foot planted and only lose a few MPH and not have the car downshift to use more fuel, then when the road becomes flat again I will be right back up to my speed slowly.

    Yes its not the best explanation, buts its pretty much true.
    Good explanation, that is exactly what happens. Drive in a hilly location and you will actually feel it.
    CC is good for flat highway , long distances where you want to rest your leg.
    1997 Red GTP 182000 miles stock
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  13. #253 Re: gas mileage 
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    After desperately needed new plugs and wires, LIM replacement, and a 180 thermo, i'm now getting 15-17 city and like 26-28hwy compared to my previous 17-19 city and 28-30 hwy. Makes sense! fml..
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  14. #254 Re: gas mileage 
    Moderator dsmuts's Avatar
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    What did you gap the plugs to? Did you check for vacuum leaks yet?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
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  15. #255  
    GrandPrix Junkie Sandman's Avatar
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    I'm getting 18-19 in the city without even trying, though only 25-26 highway. I'm wanting to retune and see where that puts me, I'm getting some decent part throttle KR when the TC is locked.
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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. #256  
    Derp RALM's Avatar
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    I'm only getting 16 atm cuz accidentally put slowkar juice in instead of regular or racekar juice in..... derp on my behalf



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    1998 Grand Prix GT 3.8L V6 N/A 211,000 Miles (RIP)

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  17. #257 Re: gas mileage 
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    Quote Originally Posted by dsmuts View Post
    What did you gap the plugs to? Did you check for vacuum leaks yet?
    Do vac leaks cause bad mpg? And i havent checked cause i cant find someone with a vac guage or whatever.
    And I dont know, my dad just bought the factory listed spark plugs and wires and installed them while i wasn't there.
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  18. #258  
    GXP Level Member Kolton Lock's Avatar
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    My vacuum pressure is at about 20.8
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  19. #259 Re: gas mileage 
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    i get 18.5 to 19.5 in the city usually and thats if i drive it like an old man which is what gm claims the gtp can do. soon i am going to do plugs in it and an intake and see if that helps even more. i ususlly 250 to 280 miles on a tank of gas
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  20. #260 Re: gas mileage 
    GTP Level Member Dee23's Avatar
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    Quote Originally Posted by PioneerGTP View Post
    Do vac leaks cause bad mpg? And i havent checked cause i cant find someone with a vac guage or whatever.
    And I dont know, my dad just bought the factory listed spark plugs and wires and installed them while i wasn't there.
    Yes, vacuum leaks can interfere with getting optimum MPG. Vac leaks arent monitored, so the MAF,IAT,IAC, arent reading that extra amount of air so the meterization gets thrown off and also it can be dirty air depending on how bad the leak is bc its not being filtered either by your air filter.

    If i can remember right, I think the Vac PSI should be around 19-22psi but if u do manage to get the VAC gauge just hook it up to the brake booster line. For a easy quick check, use CARB cleaner and spray on all the VAC lines and listen for the change of the idle.
    Not your average grocery getter, but theres always at least two things on the list.... 10w-30 Castrol Titanium and Shell 91 premium mixed with a lil 100 octane racing gas......
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