Site Sponsors & Vendors
Page 2 of 6 FirstFirst 1234 ... LastLast
Results 11 to 20 of 59

Thread: Fuel Economy

  1. #11
    Moderator, Retired -Ray-'s Avatar
    Join Date
    Aug 2008
    Location
    San Antonio, TX
    Posts
    20,172
    Post Thanks / Like

    Default

    Quote Originally Posted by LDM View Post
    I got 24.4 MPG on the trip to and from the dyno in CT. That included the dyno pull.
    I was getting 29 and once got 30 mpg when I had AFM.
    Rest in Peace Charlie!

    BMR, Brembo, Circle D, Comp Cams, Crazy Paul's Holden parts,
    Gforce axles, GRRRR8.net SS bolt kit and heater hoses, LandSpeed Development,
    Livernois, Lunati, Pedders, White auto media
    Under more construction.


    Just a GT


    Quote Originally Posted by RichsGreyGT View Post
    this site is hardcore modding central.

  2. #12
    Senior Member EngineDweller's Avatar
    Join Date
    Mar 2014
    Location
    Southeast New Jersey (LBI, Toms River, Atlantic City)
    Posts
    205
    Post Thanks / Like

    Default

    Ill be leaving around 1 eastern time, ill post my mpg for the first leg and let you guys know. Ive been running premium fuel, you think I should run 85 or 87 instead?

  3. #13
    Administrator Chewy's Avatar
    Join Date
    Aug 2008
    Location
    Bettendorf, IA
    Posts
    7,198
    Post Thanks / Like

    Default

    If it's not tuned for premium, run mid grade. 89 I believe is what it calls for.

    2009.5 MSM GXP 500ish N/A RWHP. Mods include but aren't limited to: Texas Speed 418 (6.8L) fully forged held together with ARP from top to bottom, PRC 255cc heads, Rick Crawford intake plenum, TB port, polish and tune, Roto-Fab 102mm CAI w/LS7 MAF, Kooks 1-7/8" headers wrapped with DEI, Corsa catless system, Circle D 3200 Stall, 3.45 final drive, BMR's complete street bushing kit and sway bars, Eibach Pro Kit, G-Force Axles, running on staggered VMR 710's with Bridgestone RE11 rubber. HSV triple gauge pack with Calais smokers kit mod, V6 tails, debadge/rebadge, V6 door handles, AU black door trim, Maverick Man under hood strut covers, & washer and bolt kit, fully corrected paint thanks to Adams Polishes and my hard work. Built with reliability in mind with some power for those times when you need to pass or go over a big hill. Just a poser, not a racer!

  4. #14
    Senior Member EngineDweller's Avatar
    Join Date
    Mar 2014
    Location
    Southeast New Jersey (LBI, Toms River, Atlantic City)
    Posts
    205
    Post Thanks / Like

    Default

    All the owners manual says is at least 87, but the midgrade will save me 10 to 20 cents a gallon. Thanks!
    Last edited by EngineDweller; 04-09-2014 at 08:51 PM.

  5. #15
    Moderator, Retired -Ray-'s Avatar
    Join Date
    Aug 2008
    Location
    San Antonio, TX
    Posts
    20,172
    Post Thanks / Like

    Default

    Unless you have a custom tune run 87 octane.
    Rest in Peace Charlie!

    BMR, Brembo, Circle D, Comp Cams, Crazy Paul's Holden parts,
    Gforce axles, GRRRR8.net SS bolt kit and heater hoses, LandSpeed Development,
    Livernois, Lunati, Pedders, White auto media
    Under more construction.


    Just a GT


    Quote Originally Posted by RichsGreyGT View Post
    this site is hardcore modding central.

  6. #16
    Addicted Member
    Join Date
    Feb 2012
    Posts
    744
    Post Thanks / Like

    Default

    Quote Originally Posted by -Ray- View Post
    Don't ask cammed and supercharged guys questions about fuel economy. They have no clue. LOL
    What's next Ray, a jab at V6 owners?

    On a trip from Michigan to Maine I got around 25-26mpg... There's some very low frequency drone with my exhaust so it was easy to know when AFM was on which worked in my favor.
    -Bob
    2009 MSM G8 GT - Christine

    Go:MJD Performance Tune, Kook's LTs 1 7/8", Chrome TVS2300, Little Lunati cam, etc, etc, etc...

    Warm start/idle: https://www.youtube.com/watch?v=dCwZxC-2_1o

    620 - RWHP
    563 - RWTQ

  7. #17
    Addicted Member
    Join Date
    Feb 2012
    Posts
    744
    Post Thanks / Like

    Default

    Quote Originally Posted by EngineDweller View Post
    Quick question...gotta drive the G8 to Michigan this week, any tips on fuel economy?
    Where abouts in Michigan you going? I'm sure some of us could advise good spots to eat or things to see if you have time. Also, check out gasbuddy's app if you have a smartphone. Gas can vary by 10-15cents a gallon, sometimes more, within a few miles.
    -Bob
    2009 MSM G8 GT - Christine

    Go:MJD Performance Tune, Kook's LTs 1 7/8", Chrome TVS2300, Little Lunati cam, etc, etc, etc...

    Warm start/idle: https://www.youtube.com/watch?v=dCwZxC-2_1o

    620 - RWHP
    563 - RWTQ

  8. #18
    Beyond Help Slizzo's Avatar
    Join Date
    Aug 2008
    Location
    Newington, CT
    Posts
    3,769
    Post Thanks / Like

    Default

    Quote Originally Posted by Frostopsy View Post
    My H/C/I LS3 can get between 25-30 highway. The secret is to find the car's power band and put it in cruise control. Usually it's around 70 mph. Cruise control is the key though. Our only problem is the small gas tank.


    Sent from my iPhone using Tapatalk
    I wouldn't necessarily call 19gal small...
    2016 Jungle Green Metallic Chevy SS - Sunroof/Spare/Stick
    2011 Radiant Silver Metallic CTS-V Wagon - Corsa Axleback, AirAid Intake *Sold 7/7/16*
    2008 Panther Black Metallic G8 GT * Sold 6/10/14*

  9. Likes MongosG8 liked this post
  10. #19
    Senior Member Frostopsy's Avatar
    Join Date
    May 2012
    Posts
    161
    Post Thanks / Like

    Default

    Quote Originally Posted by Slizzo View Post
    I wouldn't necessarily call 19gal small...
    For a 4000lb car with a 6.0L V8? Yah, pretty small. You only have 16 gallons before the gas light comes on. The TBSS has a 22 gal tank.


    Sent from my iPhone using Tapatalk

  11. #20
    Addicted Member
    Join Date
    Feb 2012
    Posts
    744
    Post Thanks / Like

    Default

    (shrug) our 'Burb has a 30something gallon... it's all in how you drive it.
    -Bob
    2009 MSM G8 GT - Christine

    Go:MJD Performance Tune, Kook's LTs 1 7/8", Chrome TVS2300, Little Lunati cam, etc, etc, etc...

    Warm start/idle: https://www.youtube.com/watch?v=dCwZxC-2_1o

    620 - RWHP
    563 - RWTQ

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •