2017 acadia 6 cylinder vs 4 cylinder and denali vs not review - GMC Acadia Forum: AcadiaForum.net
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post #1 of 15 (permalink) Old 04-30-2017, 08:19 PM Thread Starter
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2017 acadia 6 cylinder vs 4 cylinder and denali vs not review

for those wondering, we had a loaner the other day that was an sle 4 cylinder, which we were considering when we bought ours, but never drove one until the loaner.

The denali is really nice, I finally figured out until they fix it how to fill the thing up, so I finally verified the DIC is .5-1MPG low compared to actual. 35 highway, 30 mixed on a different highway with constant rolling hills, both at 55, and 20 in town, but that kind of mileage requires keeping the DOD in 4 cylinders as much as possible and safe. This is a very quiet and refined vehicle.

Now, the SLE. This car was just as comfortable, cloth seats and all, as the denali without adaptive suspension, has active grill shutters and stop/start. The DIC still has a nice array of pages, the radio was still good, and the transmission of coarse is the same. The active grill shutters and it always being a 4 cylinder should mean much more consistent gas mileage, so if that is a consideration, and you don't want to have to manually work to keep it in 4 cylinders to get good gas mileage, this is the car for you. You really should not tow with this engine, I'm saying this having towed 3500LBS behind a saurn ion 5 speed. This is for two main reasons: 1, the car is just so big you wouldn't have enough power to do it safely, but the biggest is; 2, the transmission doesn't have a cooler, so even on the 55 degree day we drove it, the transmission got up to 200 degrees in bad stop and go, and start/stop didn't always kick in, probably due to the frequency of the stops. I don't see the transmission lasting towing without a cooler in this arrangement. The 4 cylinder is NOT refined to the level I expected, it wasn't even on par with the 1.5T equinox LT I test drove, the stop/start was harsh (it can be disabled if desired), but was seamless enough (again, no as seamless or refined as the equinox) that it wasn't too annoying, and the sound insulation is more Saturn ion, and less Cadillac, but if you don't have the scratch, it's a perfectly nice vehicle, and quite a bit cheaper. any questions/comments are welcome, just figured I'd do a writeup since I couldn't find any comparisons.
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post #2 of 15 (permalink) Old 05-01-2017, 06:36 PM
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Re: 2017 acadia 6 cylinder vs 4 cylinder and denali vs not review

Quote:
Originally Posted by Isoldmysaturn

The denali is really nice, I finally figured out until they fix it how to fill the thing up, so I finally verified the DIC is .5-1MPG low compared to actual. 35 highway, 30 mixed on a different highway with constant rolling hills, both at 55, and 20 in town, but that kind of mileage requires keeping the DOD in 4 cylinders as much as possible and safe. This is a very quiet and refined vehicle.
How in the world do you do that, and still depress the gas pedal? Do you have to make it a point to do 25 second 0-60 acceleration times? Also with the Denali how did you know what cylinder mode you were in so you could manage it? I was of the impression the only time it would go to 4 cylinders would be steady state highway driving, so color me surprised.

You must have the patience of a saint, because I can't imagine pulling around 4000+ lbs. of vehicle with a full-time NA 2.5L 4. My hat is off to you.

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post #3 of 15 (permalink) Old 05-01-2017, 10:33 PM Thread Starter
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Re: 2017 acadia 6 cylinder vs 4 cylinder and denali vs not review

It's like lean burn on old Hondas, you develop a feel for it, and can also watch the instantaneous MPG readout to help you figure it out (obviously you can't do this the whole time driving). It can involve some pretty slow accelerations, and isn't always practical or safe, but when you can pull it off, the mileage is amazing. It helps that we're rarely in a hurry, but we can't get away with going even 1MPH under the speed limit without the cops hassling us, so it's not like we're truly hypermiling.
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post #4 of 15 (permalink) Old 05-02-2017, 11:11 AM
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Re: 2017 acadia 6 cylinder vs 4 cylinder and denali vs not review

I have a 2017 with the 6 cylinder and it often drops to 4 cylinders when I'm off nearly off the throttle. It does not appear to save much fuel, and you can feel a shutter / rumble when on 4 cylinders. There is a significant lag when switching back to 6 cylinders, and downshifting, when attempting to pull out and pass on the freeway.

My Sierra also has the AFM system which drops from 8 to 4 cylinders and I hate it. I have it turned off via a device that plugs into my ODBII port. I'm considering getting the same device for the Acadia.

I just did a trip from Toronto to Florida and put the vehicle into 2WD mode to test the fuel consumption. I averaged 27 mpg on the trip with an average speed of 67 mph.

The return trip from Florida to Toronto I left the vehicle in AWD mode and my fuel consumption was 26.9 mpg with an average speed of 66.8 mph.

Therefore I conclude that the actual fuel savings of 2WD vs AWD is so tiny, it isn't worth the hassle of switching it. When I had it in 2WD mode I was also too hard on the throttle leaving stops, and spun the tires way too much for dry weather roads... I'm so used to having the traction of four drive wheels that I was just too hard on a one wheel peel! If I only had 2WD I would need to adjust my quick starts.

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post #5 of 15 (permalink) Old 05-02-2017, 02:02 PM
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Re: 2017 acadia 6 cylinder vs 4 cylinder and denali vs not review

It would be nice to have an inside source that could confirm some of the details between the trims, especially when it comes to noise control.

We know that noise is controlled in several ways on any car.

Insulation can be foam or felt, can be located under sheet metal, inside fenders, on the firewall, inside doors, between the headliner and the roof, under the carpet.

Thicker glass can be used to deaden wind noise.

Additional rubber seals can be added at sunroofs and doors (you often hear about "triple sealed doors").

Then there's active noise cancellation using a microphone and the audio system.

It would be very interesting to hear if any of these are different between trim levels, and specifically which level.

We could probably compare the glass by looking at part numbers, but actual sound insulation would be tough to compare.

You say the sound insulation is more Saturn than Cadillac, are you certain that the noise you heard is not the difference between the 4 cylinder and the 6? Rather than having anything to do with the insulation level.
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post #6 of 15 (permalink) Old 05-02-2017, 03:26 PM
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Re: 2017 acadia 6 cylinder vs 4 cylinder and denali vs not review

The noise as well as rattle issues could be an individual issue as to what is normally carried in the car. I know some posters have posted about having rattles in the 2nd row seats, while others don't have any problems. We normally have my big wheeled in the back end and that in itself rattles so we don't notice anything other than that rattle even if we aren't carrying it.
Same with the noise issue one may think the car has irritating road noise while another doesn't hear anything out of the norm.

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post #7 of 15 (permalink) Old 05-02-2017, 04:04 PM
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Re: 2017 acadia 6 cylinder vs 4 cylinder and denali vs not review

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The noise as well as rattle issues could be an individual issue as to what is normally carried in the car. I know some posters have posted about having rattles in the 2nd row seats, while others don't have any problems. We normally have my big wheeled in the back end and that in itself rattles so we don't notice anything other than that rattle even if we aren't carrying it.
Same with the noise issue one may think the car has irritating road noise while another doesn't hear anything out of the norm.
My 2017 has a lot of rattles, same as all the previous Acadia models I've had. This one has a bad rattle from the sunroof shade (I really hate the new solid shade, wish I had the screen back again)

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post #8 of 15 (permalink) Old 05-02-2017, 04:05 PM
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Re: 2017 acadia 6 cylinder vs 4 cylinder and denali vs not review

I just got a new '17 Limited and was poking around underneath looking for differences between this one and the '14 Denali, I noticed in a few "weep holes" underneath that there was the spray-in foam insulation that had oozed out of the holes, I guess they use it to fill in some of the crevices. Was happy to see that, this car is as quiet as the Denali was. I think it was referred to as "Acoustic Insulation"...

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post #9 of 15 (permalink) Old 05-02-2017, 05:00 PM
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Re: 2017 acadia 6 cylinder vs 4 cylinder and denali vs not review

I've been very fortunate with my '14 Denali, and now the '17 Denali. I had the '14 for 40 months, and it never had anything that even remotely qualified a rattle or squeak. Even the suspension stayed the same as the day it was new. Of course, it wasn't trouble free as I had 7 different warranty repairs along the way, but no squeaks or rattles.

Fortunately, the '17 is just as quiet. Have a couple of things that may need repair when I go back for an oil change.

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post #10 of 15 (permalink) Old 05-02-2017, 09:01 PM
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Re: 2017 acadia 6 cylinder vs 4 cylinder and denali vs not review

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Originally Posted by Gordon Shumway
I've been very fortunate with my '14 Denali, and now the '17 Denali. I had the '14 for 40 months, and it never had anything that even remotely qualified a rattle or squeak. Even the suspension stayed the same as the day it was new. Of course, it wasn't trouble free as I had 7 different warranty repairs along the way, but no squeaks or rattles.

Fortunately, the '17 is just as quiet. Have a couple of things that may need repair when I go back for an oil change.
7 warranty repairs? Do you remember what for? My '14 never went back for anything but being the '17 is the same car maybe some things for me to watch for...

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