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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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#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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