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Thread: improving fuel mileage on a 3.9L

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    improving fuel mileage on a 3.9L

    I've got the 3.9L 2006 GTP

    what can i do to improve it's fuel mileage? I get 17 avg. (these are my calculations based on the gas and miles, not the computers) around 21ish highway and 15 city.

    I don't have a cold air intake or aftermarket exhaust, but what are some things that would be recommended to increase the mpg?

    thanks!

  2. #2
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    Re: improving fuel mileage on a 3.9L

    A tune is the only thing left that you can do really. You will need higher octane gas but you *might* get 1mpg or so out of it because its a more efficient and complete burn.

    I used to get that same gas mileage in my GTP 3.9L Sedan. Sucked. Absolutely nothing I could do about it. Funny thing is when I traded it in for the GTO w/ 6 speed... I'm not getting better gas mileage in the GTO by 1-2mpg.
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    Re: improving fuel mileage on a 3.9L

    I'm lazy about it so I just go with what the computer says. I have Injen cold air intake and custom exhaust, and I use cheap gas. All that and I get a combined 22.5 - 23 MPG (depending on how I drive) Oh yeah, I too have the 06 GTP Coupe.
    Traded in G6 GTP 17 September 2012 for 2011 Musang GT 5.0L 6sp manual.

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    Re: improving fuel mileage on a 3.9L

    drive like a grandma, dont let the RPM's get about 2500, use cruise control and try coasting whenever possible. I have a 06 GTP and I get about 20mpg. I work in the mountains. about a 3,500ft in altitude climb every day.

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    Quote Originally Posted by ahuhn
    so i just realized there a drawer in my room that has nothing in it but tequila, condoms and a blow up doll. cant figure out if thats a good thing or not

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    Re: improving fuel mileage on a 3.9L

    Quote Originally Posted by SergeantGrunt View Post
    I'm lazy about it so I just go with what the computer says. I have Injen cold air intake and custom exhaust, and I use cheap gas. All that and I get a combined 22.5 - 23 MPG (depending on how I drive) Oh yeah, I too have the 06 GTP Coupe.

    maybe it's because you have the coupe and it weighs less? that's just my guess.

    i'll look around for some things to do.

    i'm just 17 and i mainly drive to school and back, but one night with my gf is 50 miles, and we usually hang out twice a week. that's what sucks it down :P

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    Re: improving fuel mileage on a 3.9L

    Twice a week 100mi roundtrip to school. 4 days a week 30mi roundtrip to work. 320mi/week. Thats assuming I don't go anywhere else. Anywhere but in town it's at least a 10mi drive there and another 10 back. All hilly area too. Thats how I got the 17-19mpg in the G6. GTO it's 18-20mpg same trips.
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  7. #7


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    Re: improving fuel mileage on a 3.9L

    I have an 06 GTP couple 6 speed. I get great mileage on the highway (high 20's low 30's) but I think I can attribute that to the LONG 6th gear. 120 KPH is just 2100 RPM.

    I have intake, exhaust and tune though.

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    Re: improving fuel mileage on a 3.9L

    75mph at 2100rpm is good. at 75mph (120kph) Im at 2500rpm

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    Quote Originally Posted by ahuhn
    so i just realized there a drawer in my room that has nothing in it but tequila, condoms and a blow up doll. cant figure out if thats a good thing or not

  9. #9


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    Re: improving fuel mileage on a 3.9L

    Quote Originally Posted by snowmanG6 View Post
    75mph at 2100rpm is good. at 75mph (120kph) Im at 2500rpm
    Yeah, one of the good things GM did with the 6 Spd ... LOL

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    Re: improving fuel mileage on a 3.9L

    My tune didnt get me better gas mileage. I lost a couple MPG's....
    Even when I took it easy.
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    Re: improving fuel mileage on a 3.9L

    Quote Originally Posted by Lampoon View Post
    My tune didnt get me better gas mileage. I lost a couple MPG's....
    Even when I took it easy.
    Mine did ... but I have to keep my foot out of it.

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    Re: improving fuel mileage on a 3.9L

    Just gotta deal with it. I have about the same figures with exhaust/intake, average around 20 since having car. I do have more fun than I should with the gas. Worst right now in winter I get 17-18. On average mix of highway/country around 20. Best I've ever got up to really trying was like 23. The only aspect that I enjoyed better about my Cobalt was fuel mileage, but I didn't really have that in mind getting the GTP. Just wanted decent mpg with a fast V6
    Current: 2015 Volvo s60 t6 awd r-design platinum

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    Re: improving fuel mileage on a 3.9L

    Im 29-31mpg but I have the 3.5

    Form the historical looks of things that 3.9 likes to drink.
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  14. #14

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    Re: improving fuel mileage on a 3.9L

    I have an 08 GT, I get 22ish city 17 if I'm racing around and 32 highway. I just put crabs on so I haven't had much time to see the difference, I'm driving home this coming weekend for spring break so I will get to see the highway changes for sure 7 hour drive !!! YAY!


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    Re: improving fuel mileage on a 3.9L

    Stock I use to get 18-19 MPG. When I got a PCM tune for 93 octane on summer grade fuels I get an average of 20-21 MPG. But on winter grade fuels am still 17.5-18.5. But you have to run premuim fuel.

    My thoughts, K&N panel filter for 50 dollars-ish and dont let the car over 3K RPMs as the VVT I have noticed over the years really guzzles fuel over 3K RPMs.
    Last edited by dre256; 03-06-2011 at 06:30 PM.
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