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GMC Acadia Real World MPG

60 messages,  Last post on Aug 03, 2009 at 1:23 PM

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What is this discussion about? GMC Acadia, Fuel System, SUV

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#51 of 60 Not getting the MPG by stdavis Jun 05, 2008 (4:55 pm)
Well I have to concur with manufan1. Purchased the 08 Acadia AWD SLT2 Dec 30th 07 and have put about 5000 miles on it so far, almost 100% in town driving and I haven't seen 15 MPG yet, as a matter fact the MPG has declined to under 13 since we have started needing the AC more. In every other way the vehicle has exceeded my expectations, but I would be glad to give up performance to achieve anything approaching 18MPG in town. I have an 04 BMW X5 4.8is with 60k on it and I routinely get 16.5 in town. It's hard to imagine driving any more conservatively than what I do now. Has anyone heard of a fix that GMC might apply to improve the milage??? I've heard of programing adjustments that may change shift points in the transmission that could improve milage, Replies to this message: manufan1 (Jun 11, 2008 10:31 am)
#52 of 60 Re: Not getting the MPG [stdavis] by manufan1 Jun 11, 2008 (10:31 am)
Replying to: stdavis (Jun 05, 2008 4:55 pm) I had that software update 3 month after I bought my Acadia because GM sent me the letter for the update. It did make big difference on the accelerating performance. The update made transmission work more responsive than before and since then I started to feel I was driving a normal car, otherwise when I drove it up/down hill, or just to accelerate it, I could hear the engine noise went abnormal, tranmission odo went up & down and it was just lost control. I did not record the MPG before I did the update but I believe it was worse than now.    I think the update is only recomended for some same lot Acadias because it was a problem. Wonder how they rate their MPG 17/24, or maybe where I live has too many traffic lights?
#53 of 60 VERY Poor MPG by benmc Jul 01, 2008 (5:55 pm)
I've had my '07 SLT Acadia for over a year now and am NOT impressed with this vehicle at all! 90% of my driving is interstate, and I'm getting 19 mpg. I probably should have kept my Tahoe, which got 17 mpg! I am seriously considering selling and getting a Toyota Highlander Hybrid. This will truly be the LAST General Motors car I ever purchase. The misleading 17 city/24 highway is a true farce - and was only touted this way to sell the car. Bad move, GM!   So if you are considering purchasing an Acadia ... be FORWARNED!
#54 of 60 Acadia mpg. by olds4 Jul 07, 2008 (6:23 pm)
My wife and i have a 2007 Acadia which we have enjoyed for well over a year now.I have been very impressed with the mpg of our Acadia = 19-21 city/hwy driving.I truely find it an accomplishment for a vehicle of this size and weight not to mention the amount of power the engine puts out to get this kind of fuel milage.Just to put things into perspective - i also have a 1997 GMC Sonoma,single cab,step side with a 4cyl standard which only gets 24-28 mpg. I just wish my wife could drive a standard so we could trade off sometimes.     I have read a lot of post about Acadias on this site and i have come to the conclusion that most people do not know how to figure their fuel milage.Take my wife for instance - she always goes by what the onboard display tells her,which is sometimes not fully accurite.The onboard display was showing around 17mpg,but when i did the real math my self (miles divided by gallons of gas) it came out to 19mpg.This test being in a 3-day period of driving back and fourth to work-city/hyw 50/50.There are a lot of red lights and my foot is very heavy - so i was very happy with my results.So my point being - if you do not like the mpg that the onboard display shows - just do the math yourself,it may make you feel better.   going on 20,000 miles-and my 2nd power steering pump.a happy customer so-far.
#55 of 60 Improvements on MPG by stdavis Jul 08, 2008 (4:14 am)
After taking my Acadia back to the dealer and having them go through the car to ensure everything is 100% they told me that a couple of things might help the MPG, so I thought I would pass it along. First, I took them up on replacing the air in my tires with nitrogen. I thought this was a gimmick, but it was only 39.95 plus tax and I am willing to try anything at this point to improve the MPG. They also told me to run the tiers at 38 psi from the 32-34 I was running. Initially it looks like I gained a 1-2 MPG Second, they told me to make sure I filled up at Tier 1 gas stations and be sure to only fill up with pure gas, no ethanol. This seems to have given me another 1-2 MPG improvement. Third, they tell me that GMC will come out with a new spec for their transmission soon and that I could expect a little improvement from this as well, but it might be a while. Apparently, this will only be a programing change in the transmission shift points that should result in fewer shifts between 20-30 mph. I think the transmission shifts fine, but they tell me there are a lot of complaints regarding how much shifting the vehicle does in this range. The end result for now is that I have seen a change from ~12.5 mpg in town 14.5-15mpg. This is 100% in town driving under pretty much the worse conditions for mpg, with continuous stop and go averaging about 25-40 miles a day calculated manually over several tanks of gas and the on board computer is dead on. We'll take a nice long road trip soon and see it we can achieve anywhere near the 20mpg+ that so many people have reported getting.   I must also say that since our Acadia is only 6 months old and we have put about 6k on her that the dealer told us they would be willing to swap for a different Acadia if it came down to that. I would hate to put this to the test, but at least it was a offer that goes above and beyond what I thought they would do. I told them I might consider giving up the AWD for better MPG if I could get everything else the same. Of course the AWD shouldn't be a factor since all the driving has been done under dry conditions where the AWD shouldn't be kicking in.   White Diamond Tri-Coat 08 Acadia SLT 2 AWD
#56 of 60 Re: MPG [chezky] by shoshy5 Aug 07, 2008 (4:17 pm)
Replying to: chezky (Dec 25, 2007 2:19 am) we only get 8.2 miles per gallon city NORMAL driving. my armada got b/w 10-11 mpg. just got it about a month ago have to fill it up every 5-6 days and summmer were hardly driving like the schoolyear . the dealer said maybe the computer needs to be adjusted, is the computer eating my gas? also when i accelerate the car kind of kicks like its trying to catch up to speed.
#57 of 60 MPG by txbricklayer Dec 29, 2008 (8:19 am)
Drove to San Antonio and back from Houston over Christmas. 2008 Acadia had 22mpg going to SA and 28 coming back. Wind power rules!
#58 of 60 Re: Gas mileage experiance? [lukesdaddy] by acadiaregret Aug 03, 2009 (10:49 am)
Replying to: lukesdaddy (May 12, 2007 4:47 am) I have an 08 AWD Acadia and I get 10 mpg city / 14 mpg hwy Replies to this message: stdavis (Aug 03, 2009 12:01 pm)
#59 of 60 Re: Gas mileage experiance? [acadiaregret] by stdavis Aug 03, 2009 (12:01 pm)
Replying to: acadiaregret (Aug 03, 2009 10:49 am) If you find any solutions let me know GMC sure doesn't have any. We have never achieved anything better the 12.5-13.5 in town with very little mix of highway and 17-19 on the road. Makes me regret trading the 99 Tahoe that did better and had much more horse power and performance. At least I knew I was giving up fuel economy for performace with the Acadia I get neither. All GMC could offer was keeping the Nitogen pressure (which is a joke as far as I can tell) in the tires at 38-40 and using 100% gas with no ethanol. I think this results in about 1 mile per gallon difference. There where rumurs that GMC would come out with a better automatic shifting algorithm for the transmission, but I have never seen it.
#60 of 60 My experience by loach Aug 03, 2009 (1:23 pm)
Now that my '08 AWD Acadia is broken in, we've been getting mostly 13-14 MPG city and 20-24 MPG highway depending on conditions. We've never come close to getting the 16 MPG city EPA rating, but easily beat the 22 MPG highway rating if the conditions are favorable.   I consider these numbers to be well within reasonable tolerances. The Acadia is a bit of a pig in stop and go traffic, but really shines on the highway for a vehicle this size.

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