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i have a 2008 2wd acadia i bought used in jan of 2010. the mpg right away was so stupid, 14-17, 17.5 was my best highway mpg. I too thought it was a computer problem because the computer also seem to shift the car and the shifting was all over the place. anyway i put some engine treatment in with the oil and raised my hwy mpg to 19.5. my milage stayed there for the next couple of trips and then the car just died and stranded me.
it turns out is was a failing water pump. so the dealer replaced it and now i just got back from a 500 mile trip that i got 22.5 mpg, over 400 miles on a tank. i think whatever sensor is in the cooling system for the water pump could be the problem with some of these cars getting bad mpg.
my next step is adding hho to the engine to see how that works.
Many happy miles,
Sarah
GM Customer Service
-Car has 16k miles; well broken in
-Living in TX; no cold weather to worry about
-Tires at full pressure
-Purchased as Certified Used GMC; Assumption about inspection is everything is working as it should
Really disappointed with the mpg, and wondering if I will need to get rid of the car. Sarah/GMC - please provide some input or solid advice about steps to take to improve performance. Would be very much appreciated.
I'm sorry you are not satisfied with the fuel economy of your Acadia. It looks like the EPA fuel economy estimates for a 2011 Acadia AWD is 16 city/23 highway (FWD: 17/24). These are estimates, and your fuel economy will almost certainly vary from EPA's fuel economy rating; these numbers are obtained by tests designed by the EPA and are for the purpose of comparison shopping.
You can find more information on how your fuel economy can vary, or tips to improve your fuel economy, by visiting "Your MPG Will Still Vary" and "Gas Mileage Tips" on www.fueleconomy.gov.
Best,
Sarah
GM Customer Service
Mileage for the trip - 20.87mpg.
My window sticker says "Most drivers will achieve between 21 and 29 mpg.
I would LOVE to know how GM figures ANYONE is going to get 29mpg when I can't even get 21 with a 2WD!
*Are your tires fully inflated?
*Is your air filter dirty?
*Is the oil of the proper viscosity?
*Are the spark plugs running efficiently?
These would be good places to look (you may already have done so); http://fueleconomy.gov/ also has great resources on how to improve fuel economy.
If this is something you were thinking about having checked out, please let us know if you decide to work with one of our dealerships as we're available to help through the process. We can be reached at socialmedia@gm.com (please include the last 8 digits of your VIN).
Best,
Sarah
GM Customer Service
In January of 2011, the dealership did a transmission adjustment on my car that lowered my gas mileage by about 2 MPGs. While unhappy with this, my husband and I werent given another option. Since then the gas mileage has continued to lower.
Today, the dealership called and told me that the problem is simply I need to fill my tank up all the way and they dont recall doing any transmission adjustment on my car that would have affected gas mileage. They say they only did an "ECM" adjustment that would havent affected gas mileage. My husband and I were both present for the conversation in 2011, it was a big deal to us & we know the name of who we spoke to.
I am very unhappy with my Acadia and wouldnt recommend it to anyone. This isnt the only service issue I have had and taking it to the dealership is a hassle. It just isnt right that I will be forced to trade it in and lose money on a vehicle that I had planned to keep long term.
Regards,
Sarah
GM Customer Service
I have to suggest the performance would suffer dramatically.
Having said that, I have always held the opinion that the 3800 was one of the best motors GM ever built and they only gave it up because the Automotive Press dumped all over it as being a "Low-Tech" push-rod motor.,.
In the Lumina APV/Pontiac Trans-sport vans, with the 3800, I regularly achieved 27mpg. Admittedly they were lighter with less frontal area but aren't the new engines and transmissions supposed to be "more efficient".
Perhaps the 240HP supercharged 3800 from the Buick Park avenue Ultra/Pontiac Grand Prix GTP/Bonneville SSei would have given the Acadia enough power?
If you go back far enough to my earlier posts, my issue is that I am not able to get even CLOSE to the official highway rating of 24mpg.
At 60-65mph, flat roads and no downshifts I have almost made 21mpg, which is the bottom of the "range" of 21 to 29 mpg quoted on the window label. I have no clue how 29mpg could be achieved.
That is the "best ever" number, typical is 19mpg.
I drove GM company cars for 20 years and NEVER failed to meet or exceed the official ratings (and that was under the older more lenient EPA numbers).
I bought the Acadia fully expecting to get better mpg than the vehicle it replaced - a 1995 Buick Roadmaster wagon with a 5.7L V8 that consistently delivered 25mpg on the highway.
THAT is my issue with this car.
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!
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.
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. hyundaimpginfo.com , and Kiampginfo.com. Both have admitted to overstating mileage figures and are starting reimbursement programs for those affected, as well as reissuing the MPG figures.
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.
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...
At 620/630 miles on the odometer the average MPG is 15.1 ( I have yet to reset it though since I bought it) But to me that's pretty good for a new car. It all depends how it's been driven.
I've seen other people who get 21 - 23 MPG on their Acadia's.
I don't have a lead foot and am a normal driver, but when your combined city/highway economy is approx 15/mpg, there is something not right but no one can seem have an answer for the issue. very frustrating. it's almost like it doesn't shift correctly sometimes, there is a "slip" in the shifting, or somethign like that. not sure what else to do.
2011 Acadia Denali - NEVER gets posted milage...ever! Not even close. Tires aired up to recommended pressure, service at the recommended times, hell I put it in neutral and coast as much as possible etc., all for not. I like poking fun at myself about the lump of coal I bought at gatherings. Too bad actually like the vehicle overall, they just can't deliver get 100%. Mileage though really pisses me off and get this...service advisor said go to shell instead of mobile, might squeeze another mpg out of it. I know why he is a service writer. lol
Recently, my all wheel drive dash message came on. Here we go again...
My first post was in May of 2011. I have had my 2011 Acadia now for over three years and continue to be happy with it. It has proven to be a great family hauler and all around use vehicle. I'm getting 19 to 20 mpg with each tank of city and hwy driving. So far I have over 50k miles on it and it has not let us down yet. Just routine oil changes and tire rotations so far. I would say mileage has been fair considering its size and weight. We are a family of five with a fourth child on the way so space will not be an issue with seating for eight. I plan to keep this vehicle for a while and it should be paid off by the end of this year, if not sooner.
detroitnews.com/story/business/autos/general-motors/2016/05/20/gm-suv-owners-offered-debit-cards-overstated-mpg/84653498/