Here's my data point for comparison. If I reset the DIC mpg value on a highway with minimal hills and keep the speed at about 65 mph I get an mpg reading of 28-30 and it stays rock solid no matter how many miles I drive.

 

I want to get a good 40 minutes or so of pure highway with a reset to see if I can get great numbers, then I may not feel so bad. I will use your point of comparison as a gauge and see if I can hit the same or even better, I am only FWD.

I found another post about poor Gas Mileage and people are complaining about averaging 15 MPG city. Give me that and I will be happy

I have seen no posts with numbers quite this low. Maybe its starting in a high gear and eating up all the gas. It does not seem to drive as smooth as the Outlook or Acadias I test drove.

I hate bad gas mileage because I love this car and am glad I picked it over Outlook or ugh the Mazda CX-9.

 

My Acadia is also FWD. I should note that I had the A/C compressor on during the MPG test. This likely cost 2-3 MPG.

 

last week i drove around 350 miles going to arizona and my speed between 75-80 mph my average gas is 20m/g..going back to san diego my speed is between 70-73mph,87 octane and the average is 28m/g.I think you will have a good mileage if your speed is around 70 :blob: :cheers:

 

last week i drove around 350 miles going to arizona and my speed between 75-80 mph my average gas is 20m/g..going back to san diego my speed is between 70-73mph,87 octane and the average is 28m/g.I think you will have a good mileage if your speed is around 70 :blob: :cheers:

70mph makes my mpg drop like a rock. My "test" over the past four weeks has been to adhere to the posted speed limit everywhere I go and this has improved my mpg dramatically (like from barely 16mpg to 21mpg) which I consider a pretty good increase. That's a mix of city and highway driving, though mostly tollway and sometimes stop and go tollway traffic.

8mpg seems absurd. Even brand spankin' new, mine never got mileage that awful. I think I have around 25K on mine now. I hope you see some improvement soon!

 

I wonder if the parking brake or a brake caliper is sticking because even with a leadfoot behind the wheel we still get 16.
When I drive we'll get at least 3 more MPG.

 

8 mpg is not normal. 11 - 13 can be expected if you driving habits are really bad, but 8 mpg is just not OK.

 

are you doing manual calculations, too? I'm wondering if your DIC is off a little (understandably you are getting far too low, but MAYBE it's 10 instead of 8)...

I would run several drive tests, resetting the DIC each time. compare city to highway, drive speed limit, drive less than limit, drive over. keep track of each test. plot a route that will meet the needs of the test (no stoplights, lots of lights, etc).

it may be just a "break in" issue, but I've never heard of something so low.

what fuel are you using? E85? E10? Regular? That will make a difference, too. I get about 4 mpg better on regular than I do on ethanol.

 

what fuel are you using? E85? E10? Regular? That will make a difference, too. I get about 4 mpg better on regular than I do on ethanol.

Since when can you run E85 in these? Sounds like your running E85 but I am sure that these vehicles are not supposed to run on E85. 10% is almost standard, so I am sure thats okay, that car should not be running on E85 if it is.
I have no clue what we are getting because every time my wife fills up before I can get to it, she puts half a tank in hno:. If she wasn't so cute, I would be mad.

 

My SLE FWD have about 17.5 -18 MPG with little aggressive driving in morning hours. All driving in heavy traffic. When I got this car I have about 15 MPG, then after 3000 miles got better.

 

I feel the pain....I drive 10 miles a day to and from work, stop and go. I do NOT have a lead foot. I baby the Acadia to get the best mileage I can...oh and guess what that is.....13mpg. I've got 2400 miles on it now. BUT with that complaint, I knew what I was getting into when I bought it. I was just hoping it was better than 13 mpg. Total bummer....8mpg does not make sense at all, I would seriously have them check into it!

 

8 MPG? That is either a bad joke, or you need to drop your vehicle off at the dealer and tell them to give you a new Yukon Denali to drive until they fix your Acadia.

 

Gas "average" is 16/22.

Expect to be lower than "average" 50% of the time...

I would be suspect of those always tauting above average MPG. If all the hype you hear on this site is true, GMC is the worst marketing car company I know - and is intentionally providing lower than average MPG on their Acadia line...not likely - nor are claims of 30 MPG...

In this fuel market, I can't imagine any car dealer not maxing their "averages" as best they can. 16/22 is the MAX average for the Acadia. Expect to "average" that long term.

I've never received 8MPG though....and definitely not 30MPG. I'm fat on average.

One thing I can guarantee is the $70 fill-ups!!

 

A little gas price humor :cheers:

 

Cheers to that sign maker!

 

This is from about.com. You can follow the link or read the pasted text in case the link doesn't work or is removed later. http://cars.about.com/od/fueleconomyinfo/a/epa_mpg_testing.htm

How the EPA tests fuel economy
By Aaron Gold, About.com

Filed In:Fuel Economy


MPG Mileage
The Environmental Protection Agency (EPA) has mandatory fuel-economy tests that must be carried out on all cars (but not all light trucks) sold in the US. Most of the tests are carried out by the automotive manufacturers. The EPA tests 10 to 15% of the cars to verify the results.

Old method (2007 and earlier)
The fuel economy tests are run on a dynamometer, a pair of rollers that works like a treadmill for cars. The rollers can create resistance to simulate factors such as wind drag. The test consists of a city cycle and a highway cycle. All tests are climate-controlled to simulate a 75 degree day and no accessories (such as air conditioning) are used. Two tests, the city cycle test and highway cycle tests, are carried out as follows:

City cycle
Trip length: 11 miles
Test time: 31 minutes
Number of stops: 23
Time spent idling: approx. 18%
Maximum speed: 56 MPH
Average speed: 20 MPH
Engine temp at startup: Cold (75 degrees outside air temperature)

Highway cycle
Trip length: 10 miles
Test time: 12.5 minutes
Number of stops: None
Time spent idling: None
Maximum speed: 60 MPH
Average speed: 48 MPH
Engine temp at startup: Warm


New method (2008 and later)
It's common knowledge that EPA fuel economy estimates do not reflect real world mileage, and are particularly advantageous for hybrids. Because of these known discrepancies, the EPA decided to revise its testing methods. Tests will continue to use a dynamometer. Changes will include:
Higher speeds - up to 80 MPH on the highway cycle
Colder temperatures - tests will now start at 20 degrees Fahrenheit rather than 75
More rapid acceleration
Use of accessories - the air conditioner will be operated 13% of the time
Results of the new method
The new testing methods will drop city fuel economy estimates by 10% to 20%, with hybrids taking the highest percentage. Highway estimates will drop by around 5% to 15%.
The new methods -- which will be accompanied by a new fuel-economy label on the car's price sticker -- will apply to 2008 model year cars manufactured after September 1, 2007. Through June, automakers will be allowed to attach an additional label showing what fuel economy estimates would be using the old test methods.

Current regulations only include vehicles with a GVWR (Gross Vehicle Weight Rating - the maximum permissible weight of the vehicle, fuel, and payload, including passengers) of up to 8,500 lbs, which excludes many large SUVs, vans and pickups. By 2011, manufacturers will be required to apply EPA fuel-economy ratings to medium-duty vehicles with GVWRs of 8,500 to 11,000 lbs.


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That's interesting! Thanks :thumb:

 

Well still no improvement. Average is 7.2 MPG all city. Check engine light has now come on and remote start stopped working, I am taking it in tomorrow morning. They said remote start disables if check engine light is on.

I hope they make it right, I love this car, but early problems like this scare me, especially since this car came off the plant floor Feb 2008.

 

I dropped it off today and the loaner they gave me is a sweet 2008 Chevy Tahoe. What gets me is that this v-8 beast is getting 15.9 MPG. I went with a v-6 car thinking I would save money on gas. Boy this really stinks.

They said this morning that I should get the Acadia back by tonight but I doubt it. I am curious to see what modifications they make, that will make the car run leaner. The MPG problem concerns me more the the recent check engine light.

I will keep you posted

 

I can only hope a ECM flash will fix what ills your poor Acadia. Keep us updated.

 

I dont know what an ECM flash is, but I hope so too.

It would appear that its an overnight fix since they never called me today to tell me what they found. I read all the good posts and even a post where people are complaining about getting 14 MPG and I am jealous. I want my Acadia to be one of the good ones and not one of the lemons. The dvd issues and the leaky sunroofs have not been a problem for me, but I would trade the gas mileage problem for one of those. The MPG problem is costing me a small fortune.

883 miles on 5 tanks of gas at $70 each fill up. I may have to buy an ecnobox and let the Acadia sit. That sucks

 

Keep us posted. The check engine light coming on is kinda unusual for a car that new. Hopefully, thats what the problem is. Do find out why the light came on.

 

I called onstar and asked them to tell me what the SOS code was when the light came on. They told me thay could not give me the code, that I would have to request this in writing (snail mail only) from Onstar. After some serious complaining the finally at least told me what the problem read when the light came on. "powertrain detects system malfunction relating to ignition system".

The dealer has had car for 2 days and they have not even given me a clue as to what is wrong with it, I am not familiar with PA lemon laws but this sounds like trouble to be having major issues so early on.

PS. All dealer/service contact has been initiated by me, they have not once tried to call me to keep me apprised of situation.

I will not, absolutely will not take the car back unless SOS is resolved and there is SIGNIFICANT inprovement in the average MPG. I will take dealer on a ride to show that I am not nuts and do not drive with a lead foot. They tried to plame the 7.2 MPG on dirty Philadelphia gas or because of break in. Guess what, I drive to NJ to fill up because gas is .40 less per gallon, so tell me another one about how my city's gas is dirty. As for break in, 7.2 MPG is just plain ridiculous and there is no way that "break in" is causing MPG to be so low.

 

this is like a bad joke, they finally called me back to tell me that they could find nothing wrong with the car and they dont know why the SOS light came on but its not on anymore. They again tried to blame the poor gas mileage on break in and that it would improve after 3000 miles. I told them a 75 fill up is getting me 100 miles so by the time I get to 3000 miles I would be bankrupt. I told them them to keep it and they will be hearing from my lawyer. I have never soured on a car so quickly but this is nuts

PA Lemon Law anyone?

 

Did you try a different dealer?