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GMC Acadia Real World MPG



  • obyoneobyone Posts: 8,065
    Your mileage with the roadmaster had more to do with the gearing in the 4L60e rather than that pushrod 5.7 v8. That same 5.7 in a '00 Yukon Denali returned 10.5 city and 13 highway.
  • So you are saying a 2.93 axle in a Yukon/Denali will get 25mpg??!!
    I suspect not.
    But you are missing my point.
    My Roadmaster was rated at 26mpg under the old ratings (which would be closer to 23 under the 2008 and later standards)
    I repeatedly got 25.
    My Acadia is rated at 24mpg under the new ratings. I get 19 with a best ever of 21.
    THAT is my issue!
  • sam1940sam1940 Posts: 3
    edited October 2012
    I have a 2011 Acadia FWD and became aware the same rpm vs. speed issue as you. At around 40 mph (city driving speed) the engine rpm is 2000. This is very fuel inefficient. When the cruise is engaged, the rpm drops to 1400 which is the transmission shifting from 4th to 5th gear. Similar shifting changes occur at lower speeds as well when the cruise engaged. Of course, I don't normally drive around town with cruise control engaged. Thinking that it should not be necessary to engage cruise to control to have the transmission shift at town speeds, I wrote GM and they sent me to a dealer to have it checked. The dealer hooked up their computer monitor during a test drive and found as I had experienced, that at 40 mph, the engine speed was 2000 rpm and engaging the cruise it dropped to 1400 rpm. Then disenging the cruise the rpm increased to 2000 rpm. Interestingly, we (dealer service tech and service manager) tested a 2012 Acadis. The 2012 shifted as I would hope, 1400 rpm at 40 mph with or without the cruise engaged. Other words GM had corrected the problem with the new models. CORRECTION OF THIS PROBLEM WOULD BE TO SIMPLY RE PROGRAMING OF THE COMPUTER MODULE LIKE THE 2012. However GM tech support would not do this. So all of us with 2011 Acadias and older are stuck with a gas hog. (GM TAC CASE 71-1048356874)
  • Poor mileage in city driving is partly the fault of the transmission not shifting from 4th to 5th at speeds around 40mph. The engine thus turns at 2000 rpm instead of 1400 rpm if it would shift. Other cars I have driven have an engine speed around 1200 to 1400rpm at 40mph. If you engage the cruise control it will shift up to 5th at these speeds and if you disengage the cruise it will shift back to 4th. I tested a 2012 and this problem has been corrected. The shifting pattern was verified by the dealer. The problem can be corrected by re programing the computer module. I complained to GM and they refused to do anything. This is a matter of poor engineering and a big company ignoring the customer. So long GM.
  • To Caron, GM Customer Service, - the problem will not be taken care of until GM TAC let's the dealers re-program the computer module to let the transmission upshift from 4th to 5th during city driving thus reducing the engine rpms from 2000 to 1400. The driver can force the shift by engaging the cruise control, but in city driving that is silly. Engaging the cruise at 45mph will also permit an upshift from 5th to 6th reducing the engine speed to 1200 rpm. Why can't GM get with it and help out Acadia owners get better gas mileage?
  • kaydeejaykaydeejay Posts: 13
    edited October 2012
    While this may well be an issue, it will not help those of us who cannot regularly get within 4mpg of the heavily published and advertised 24mpg highway mileage for a 2WD.
    My best ever 20.7 was at 60mph across New York State with a tailwind!

    Do we have documented test results to support an increase in mileage at 1400 vs 2000 rpms at the same road speed. That is not a foregone conclusion.

    What changed for 2013? I have a friend driving a GM company 2013 right now and is getting 22mpg with a fully loaded AWD Denali.
  • bdylan4771bdylan4771 Posts: 2
    edited November 2012
    I have owned this vehicle that I originally posted about over a year now, and the fuel economy issue is still very frustrating.
    Customer service representatives remind us that the EPA tests are for shopping comparison purposes only. Those mileage figures were a deciding factor for me in purchasing this vehicle. This is precisely why I am so disappointed with this vehicle. I get pretty close to the sticker figure on other vehicles I drive and no where close on this one. I feel I was misled by overstated MPG figures.
    Please don't give us the canned response to MPG issues. I am not a tech, but we all know the major things that affect fuel economy.. driving habits, tire pressure...etc. Transmission programming? This seems to be an issue, but I am told this all checks out. I assume the MPG testing was done with the same configuration as is available to the public. I know the MPG testing is designed by the EPA but it needs to be performed by them or some other 3rd party. Then, at least we could look at these figures as factual and unbiased and would stand less of a chance of being overstated as I feel is the current situation. I realize this is a bigger issue with the EPA and is beyond GM control.
    I did find these sites interesting. , and Both have admitted to overstating mileage figures and are starting reimbursement programs for those affected, as well as reissuing the MPG figures.
  • Stever@EdmundsStever@Edmunds YooperlandPosts: 38,919
    You forgot the Honda Civic Hybrid. :shades: (US News)
  • monicaotmonicaot Posts: 2
    I posted on here almost two years ago complaining about my Acadia. I just wanted to share that I just got rid of the Acadia and got into a chevy equinox. I feel liberated! Freed from the chains binding me to unaffordable gas and horrific gas mileage! I'm averaging 23 mpg compared to the 12 mpg I was getting in the Acadia, I've cut my car payment in half and am loving the new car! Just wanted to share!
  • huedawghuedawg Posts: 5
    Good for you and same here ! GM ended up buying our Acadia back . We now have a 2013 Traverse and it's doing great ! MPG on the highway is around 24 with awd and 16-17 city . Couldn't be happier ! I would like to applaud GM for the smooth transition and such ! They helped every step of the way . They have renewed our faith , so to speak .
  • kaydeejaykaydeejay Posts: 13
    One more year to go on my 2011 Acadia lease, then the pig will be gone!
    Because no-one at GM or the dealer gives a damn about the real-world mileages of these vehicles, this GM retiree will be looking at NON-GM vehicles for the replacement!
    I can't wait!
    Customer Service - please pass this up the chain in case there is some-one some-where who actually cares about what their customers are saying.
  • kaydeejaykaydeejay Posts: 13
    Wow! On what basis did you get a Buy-Back? Not the mileage I assume?
  • 62vette62vette Posts: 17
    I leased a new Acadia a couple weeks ago. Just been driving it around town then finally on Thursday I had a reason to drive it on the freeway about 140 miles roundtrip. Filled up the night before and then hit the freeway. Mileage started low and kept creeping up, just when I was getting to the turnoff I needed it was at 23.8.Then drove surface streets for a while and drove home, averaged 22.5 for the trip. For a car with about 450 miles on it, I thought this was great.
  • hillenhillen Posts: 1
    has anyone tried a programmer to change shifting patterns
  • huedawghuedawg Posts: 5
    The transmission would not shift . The RPM's were always high . They tried new shift modules and other stuff to no avail . If they didn't buy it back , then by law , it was a lemon anyway and they stood to loose a lot more . That said , they were great to work with and it was a quick process . We had lost all faith in GM but their actions have turned that around . In fact , I was so impressed with the way they handled it that afterwards , I recommended a fleet deal to my employer for 10 Colorado's , which they are currently finalizing .
  • 1gmc1gmc Posts: 1
    Just leased a 2013 SLT1 2WD last week and drove it from Phoenix to Laguna Beach CA. Two adults, three kids, lugage, stroller boogie board etc.., average speed 75+. The trip home included a couple hundred pounds of beach sand and more luggage. Had room for all, locked the cruize on 85 for long streaches and passed a couple 18 wheelers at around 95. Average MPG for the trip was 18.5. Bigest complete, the GPS touch screen froze several times and takes multiple touches to respond.
  • handydadyhandydady Posts: 2
    I bought a 2013 GMC Acadia early this year and feel the same way you do. I am disappointed at GM engineering, the engine has plenty power to have two diving modes, standard for towing and heavy foot folks, and economy for easy driving. The engine stays at high RPM before downshifting for easy driving and will run around 2000 RPM to coast at about 75 MPH. If you want to make up to 26 MPG, keep the RPM between 1400 and 1600; the only problem is that the max speed you will reach is about 55 MPH.
  • hdaohdao Posts: 20
    I agree. My 2007 Acadia can get up to 26 MPG on highway with super unleaded and my average speed is from 65-72. I don't count on display gas mileage meter but calculating by filling up then setting a trip odometer to zero. Drove a long trip on highway from Houston to Dallas. On the next fill-up, I take the total miles then divided total of gallons just filled-up. In city, my Acadia can get around 16-18 GPM. I always try to run over 42 MPH in order to have a transmission shifted to 5th or 6th. Driving under 42 MPH will make it gas sucker as you mentioned.
  • I have a 2013 Acadia and get 17 MPG city driving and 24 on the highway. Have to drive about 1800 RPM.
  • We bought our 2011 Acadia (AWD) thinking it would have better gas mileage than our 2006 Jeep Grand Cherokee. We've been tremendously disappointed and I would not buy another Acadia. The window sticker said 16 mpg city and 23 highway, and we've been no where near that. City runs about 10 mpg and highway is about 16. I've asked the dealer to look at it twice and they told me there's nothing wrong with it. "Must be the way you drive it, your driving mix, etc...". I understand the projected mileage is a range, but to be off by 35% on city 30% on the highway is ridiculous. It's not an apple to apple comparison, but the projected mileage on my 2012 Ford Focus has been dead on.

    Another annoyance is the interior fit and finish. There's a squeak in the headliner of our Acadia that the dealer hasn't been able to find. It's been squeaking since about 5K miles and we have 35K on our Acadia now. Also have had some problems with interior plastic interior trim pieces breaking and falling off. Granted, it's just a squeak and the dealer replaced the trim pieces under warranty. But, I expect a lot more from $40K vehicle...
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