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  1. #1
    Join Date
    Nov 2008
    Location
    Villa Rica GA
    Posts
    51

    Default G8/GT stock - gas mileage update - how about others?

    On our mother's day trip to my son's house and back I tested the mpg for the round trip of just over 120 miles. Going to his house the mpg was a flat 28, primarily cruising at 65mph and relied on cruise control as much as possible. This is on interstate for approx. 75% of the distance, then 55 mph or less for the rest of the trip. The return trip netted 24.2mpg. This was due to having some stop and go running around while in the area of my son's house to go out and eat. So the overall mpg was about 26. I don't think that was too bad for this vehicle. The terrain here in the Atlanta GA area is mixed up and down hills and inclines on the interstates as well as the surface streets. I have clocked as much as 28.7 mpg on a trip to Florida (more than 550 miles one way). This was by using the old "fill-the-tank-at-the-start" and "fill-the-tank-at-the-end", then calculate the mpg, not relying on the DIC reading (which in my car happens to be quite close - within 1 mpg or so).
    The car now has almost 34000 miles and still performs flawlessly - a real pleasure to drive.
    Anyone else having similar experiences?
    Frank

  2. #2

    Default

    Seems pretty good. About the same mileage as the GTO(05,06), maybe a little better. Different heads and camshaft along with tunung are the main difference in ponies from the same block. In my 2004 GTO at 70 mph in 6th gear I am at about 1900 RPM's. The 292 gear in the G8 should make for some lower RPM's than the 346 does in the GTO.i Makes for some good gas mileage. I just cant get myself to drive in 6th gear for some reason.
    Last edited by cquist; June 1st, 2011 at 17:10.
    2004 GTO TR m6 2004 SAP,D-1SC Procharger,4.0 pulley,Siemens 60# injectors,Walbro 340,KB BAP,160 T-stat,oil breather,06 tails,Ruff 278's, 245/40/18-275/35/18,TB bypass,Kooks longtubes(cated),Loudmouth 2,DIY catchcan,Autolite 5144s,06 brake upgrade.Comp cam 224/228,581/588,112+4 lsa. Patriot gold dual springs, seats,locks,and retainers.TrickFlow push rods.243 Z06 heads.GMM Ripshift, Optima Red, Axxis pads.Ported TB,Monster stage 3 clutch,EPP tune.608/569 L8R MAN
    2004-2006 GTO and G8 Tech Advisor

  3. #3

    Default

    I have found that my best highway mileage occurs when I place the automatic trans in manual 6 and run at 70-75 mph. I also have noted, the maximum economy occurs when using premium fuel.
    Dave "Big Injun" Anderson
    dave@4mypontiac.com
    '66 GeeTOW Wagon (Tempest Custom)
    '67 GTO Pro-Street
    '01 GTP
    '09 G8 GT

  4. #4
    Join Date
    Nov 2008
    Location
    Villa Rica GA
    Posts
    51

    Default

    A recent round trip from Atlanta GA area to central Florida netted an overall mpg of 27.3. This is by fill-up and calculate method, not the DIC reading (although it is usually quite close, + or -. MY G8/GT now has just over 49k miles. I try to keep 35-36 psi tire pressure all around - cold - and have found this to work best for me.

    Anyone else with an update?

    Frank

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