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Old 12-06-2017, 12:57 PM   #1
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Default real mileage on a 2018 chevy Z71 with the 6.2 ltr motor?

I have a 2016 4 door LTZ with the 5.3 and I love the truck. But with the 6 speed transmission it seems to go to a higher gear too quickly @ 20MPH and then again @ 40MPH. it then gets to @ 1K RPMs and seems bogged down.

I called the dealer and they brought it in for service. Said they had a bulletin on it and they fixed it.. except it isn't fixed.. They will bring it back and try again but I cant stand it..

I love the truck but am already looking for another one just in case.

So a guy a know at a GMC dealership said the 6.2 gas was what I should get. He said it gets better gas mileage than the 2016 5.3

I know the guy but not sure I trust this.. I had the 6.0 in the past and it was a thirsty beast. Pulled great but 10 MPG was constant..

Anyone know about the 2018 6.2 LTR engines and gas mileage?

Last edited by lumberman; 12-07-2017 at 05:00 AM.
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Old 12-06-2017, 02:15 PM   #2
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I bought a '17 LTZ Z71 with the 6.2L. Truck now has 11K miles on it.

Mileage wise - I'm seeing 18-18.5 in combined city/highway driving around Atlanta. If it's more city than highway, it drops into the 16s. Highway mileage has been between 21-22 mpg on extended trips to and from Florida. The 6.2 engine requires premium gas to function at optimum levels, and that's a $.50/gallon increase around here.

If you are having transmission issues, my recommendation it to tread lightly. I'm navigating through the minefield of transmission vibration/shudder/hard shifting issues on mine, and the lemon law is not out of the question. Drive one thoroughly to make sure you get a good one before you sign on the dotted line.
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Old 12-06-2017, 02:23 PM   #3
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6.2 is very efficient, Lifetime mileage on our Escalade is 18 which includes city highway mix and some towing. Highway mileage empty is 20-22 depending if you're head wind or tail wind, straight city is 16 if you don't drive it like you stole it (hard to do with 420 HP). Towing 8500 pounds, it gets around 10.

Tranny was an issue on it, hard shifts when cold and clunks, GM finally replaced it and it has been perfect since. I'm sure an '18 will be good to go too.
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Old 12-06-2017, 02:55 PM   #4
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Thanks for the responses. So the mileage wont kill me and it can tow more. That is great news.. Helps for sure. Was considering a diesel but towing 10% of the time I cant make sense of it..
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Old 12-06-2017, 03:10 PM   #5
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Have a 15' Yukon 5.3l and I wish I could see those city #'s for a 6.2l.

I am seeing 13.5 city and about 19 combined.

Highway is better @ around 22 - 23 but again that a 5.3l w/3.42 rear end.
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Old 12-06-2017, 04:22 PM   #6
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I was not aware they put the 8 speed in the 5.3 models. Thought it was only available with 6.2L?
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Old 12-06-2017, 07:30 PM   #7
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Keep in mind the 6.2L recommends premium fuel.
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Old 12-07-2017, 05:00 AM   #8
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Originally Posted by tripleplay1 View Post
I was not aware they put the 8 speed in the 5.3 models. Thought it was only available with 6.2L?


Sorry man, I misspoke.. it is the 6 speed.. I will edit. They are coming with the 8 speed.. thanks!
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Old 12-07-2017, 05:05 AM   #9
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Originally Posted by lumberman View Post
....

So a guy a know at a GMC dealership said the 6.2 gas was what I should get. He said it gets better gas mileage than the 2016 5.3

I know the guy but not sure I trust this.. I had the 6.0 in the past and it was a thirsty beast. Pulled great but 10 MPG was constant.....
My understanding is the 6.2 and 6.0 are very different engines. So they aren't really comparable. I have heard only good things about the 6.2 with respect to fuel economy (for its size/power).
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Old 12-07-2017, 06:11 AM   #10
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My understanding is the 6.2 and 6.0 are very different engines. So they aren't really comparable. I have heard only good things about the 6.2 with respect to fuel economy (for its size/power).
Economy would seem excellent vs the same vintage 5.3, however that mill is supposed to run on premium fuels and in this neck of the woods averages $0.75/gallon round here
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Old 12-07-2017, 06:15 AM   #11
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Quote:
Originally Posted by Parthery View Post
I bought a '17 LTZ Z71 with the 6.2L. Truck now has 11K miles on it.

Mileage wise - I'm seeing 18-18.5 in combined city/highway driving around Atlanta. If it's more city than highway, it drops into the 16s. Highway mileage has been between 21-22 mpg on extended trips to and from Florida. The 6.2 engine requires premium gas to function at optimum levels, and that's a $.50/gallon increase around here.

If you are having transmission issues, my recommendation it to tread lightly. I'm navigating through the minefield of transmission vibration/shudder/hard shifting issues on mine, and the lemon law is not out of the question. Drive one thoroughly to make sure you get a good one before you sign on the dotted line.
I am getting a hair under that on mine... I think 17.5-18 but I dont do much highway driving
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Old 12-07-2017, 06:37 AM   #12
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Originally Posted by sundancekid View Post
6.2 is very efficient, Lifetime mileage on our Escalade is 18 which includes city highway mix and some towing. Highway mileage empty is 20-22 depending if you're head wind or tail wind, straight city is 16 if you don't drive it like you stole it (hard to do with 420 HP). Towing 8500 pounds, it gets around 10.

Tranny was an issue on it, hard shifts when cold and clunks, GM finally replaced it and it has been perfect since. I'm sure an '18 will be good to go too.
My wife's last 2 Escalades had the 6.2L and the Denali before them did too. Our mileage experience wasn't as good as above but it may be because I tend to drive fast and my wife tends to drive quick. Other family members have owned the 6.2L also. It's a very good engine but mileage really depends on driving style when you have 400+ HP and a big heavy vehicle. If it's an option for the vehicle you want I would highly recommend getting it.
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Old 12-07-2017, 06:50 AM   #13
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Co-owner in our business has a 16 6.2 8 speed and is seeing 20+ all the time, and he does not have a light foot. Thing makes great power, and is very nice. Nearly 100% of his driving is secondary roads running 45 - 65, with virtually no traffic. According to him it will drop to right at 20 on the interstate, but he rarely drives it on the hwy.
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Old 12-07-2017, 07:04 AM   #14
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Originally Posted by magua View Post
Economy would seem excellent vs the same vintage 5.3, however that mill is supposed to run on premium fuels and in this neck of the woods averages $0.75/gallon round here
Copy that. I have to run premium in my Honda Ridgeline for towing, so I am used to the higher price.
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Old 12-07-2017, 07:09 AM   #15
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Copy that. I have to run premium in my Honda Ridgeline for towing, so I am used to the higher price.
Impressive power from that mill though
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Old 12-07-2017, 07:36 AM   #16
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Sorry man, I misspoke.. it is the 6 speed.. I will edit. They are coming with the 8 speed.. thanks!
Actually you can get the 8 speed in some packages with the 5.3. we have a 2016 Silverado with that package.
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Old 12-07-2017, 09:53 AM   #17
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thanks for all the great feedback guys!


I want the truck but didn't want the same 10 MPG I was getting with the 6.0 a few years back.
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Old 12-07-2017, 10:23 AM   #18
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Originally Posted by tripleplay1 View Post
I was not aware they put the 8 speed in the 5.3 models. Thought it was only available with 6.2L?
They do offer the 8A with the 5.3 on LTZ (Chevy) and SLT (GMC).

I wouldn't bother, the 8-speed has been problematic it seems.

Go with the 6.2
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Old 12-07-2017, 10:52 AM   #19
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thanks for all the great feedback guys!


I want the truck but didn't want the same 10 MPG I was getting with the 6.0 a few years back.
Two entirely different engines. The 6.0 was designed to be a high torque motor for towing. The 6.2L was designed for high horse power with good fuel mileage for luxury vehicles.
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Old 12-07-2017, 01:42 PM   #20
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SO - working a deal now between two dealers.. thanks for all the info about the mileage being close to the same. that helps a lot!
Is it a definite noticeable difference in the pulling power with the 6.2 over the 5.3 like I hope it will be?
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