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Thread: 2 Questions: '17 Duramax 6.6L Turbo Fuel Economy Question & AFM '18 1500 6.2 gas

  1. 01-08-2020, 11:50 PM #1
    gooseaholic
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    Default 2 Questions: '17 Duramax 6.6L Turbo Fuel Economy Question & AFM '18 1500 6.2 gas

    I am dialing in on my next vehicle and am leaning toward the '17 6.6L Duramax, but don't know if it will make sense to drive the diesel everyday.

    Question 1:

    What can I expect in fuel economy (non-towing) in a '17 duramax 6.6L turbo without tuning and what can I expect after tuning? The numbers online go from 14.4-24 mpg avg. What upgrades/replacement parts are suggested to improve the fuel economy of a stock engine?

    Question 2:

    Is the AFM issue the same in all engine sizes? I would prefer the 6.2L gas if I end up not getting the diesel.
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  2. 01-09-2020, 06:06 AM #2
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    Are you planning to put bigger tires on it? I had the 6.2 in a 17 Sierra and really loved it, I would get an average of 16-17 with 34 inch tires and it had plenty of power. Currently have a Duramax with 35s with the Derringer and ram air and do good to get 15. It is crazy what the tuner did for this truck. I did get better mileage with the factory tires but I didn’t leave them on long enough to speak intelligently about it. That Duramax felt very Trucky after having at 6.2. You can’t go wrong with a 6.2
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  3. 01-09-2020, 06:24 AM #3
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    I have had 2 6.2s recently, 2014 & 2016. Both got 12-14 but had no “get up and go “ at highway speed. And forgot jumping over in the left lane and mashing the gas to quickly pass someone. They get the job done but nowhere near compared to the 6.6. Especially if you’re used to driving the diesel it takes a little bit of getting used to not having that power.

    The Duramax stock should get you 14-16 running down the highway. And not have any of the shortcomings I listed above.
    Last edited by Steelin' Ducks; 01-09-2020 at 06:25 AM.
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  4. 01-09-2020, 07:16 AM #4
    Duckkiller
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    Stock Duramax leveled on 35’s. I get 14.4 average.
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  5. 01-09-2020, 07:48 AM #5
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    Quote Originally Posted by Steelin' Ducks View Post
    I have had 2 6.2s recently, 2014 & 2016. Both got 12-14 but had no “get up and go “ at highway speed. And forgot jumping over in the left lane and mashing the gas to quickly pass someone. They get the job done but nowhere near compared to the 6.6. Especially if you’re used to driving the diesel it takes a little bit of getting used to not having that power.

    The Duramax stock should get you 14-16 running down the highway. And not have any of the shortcomings I listed above.
    Never heard anybody with a 6.2 say they didn’t have get up and go...now the 6.0’s are pitiful
    "And ignoring people on here....that's like being home schooled. Just say you're not ready to face life." Highstrung
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  6. 01-09-2020, 08:09 AM #6
    gooseaholic
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    I never had a diesel but the test drive on the 6.6 turbo was really impressive.
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  7. 01-09-2020, 08:20 AM #7
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    My 5.3 will light um up if you ain't careful when you pull out to pass. Plenty of go.
    Gettin old is for pussies! AND MY NEW TRUE people say like Capt. Tom >>>>>>>>>/
    "Wow, often imitated but never duplicated. No one can do it like the master. My hat is off to you DRDUCK!"
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  8. 01-09-2020, 08:27 AM #8
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    Quote Originally Posted by pee dee View Post
    Never heard anybody with a 6.2 say they didn’t have get up and go...now the 6.0’s are pitiful
    Maybe I'm mistaken on which one was in those trucks, 6.0 vs 6.2 gas motor in 2500s.
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  9. 01-09-2020, 11:48 AM #9
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    Quote Originally Posted by Steelin' Ducks View Post
    Maybe I'm mistaken on which one was in those trucks, 6.0 vs 6.2 gas motor in 2500s.
    That is the 6.slow in the 2500
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  10. 01-09-2020, 02:02 PM #10
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    6.2 gas
    Gettin old is for pussies! AND MY NEW TRUE people say like Capt. Tom >>>>>>>>>/
    "Wow, often imitated but never duplicated. No one can do it like the master. My hat is off to you DRDUCK!"
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  11. 01-09-2020, 04:00 PM #11
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    I have the L5P duramax in my '17. I avg. 22 mpg on the highway(60mph). I avg 17 mpg on the interstate (80) going to work everyday. Running 275/65 k02 tires. All stock, no tunes.
    Last edited by CUducks648; 01-09-2020 at 04:01 PM.
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  12. 01-09-2020, 04:37 PM #12
    gooseaholic
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    The truck I am looking at with the 6.6L diesel has Nitto Trail Grappler 295/70r 18 tires.
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  13. 01-10-2020, 05:36 AM #13
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    Y’all go back and forth...Gas HD vs Diesel HD...

    Shit stresses me out lolz


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  14. 01-10-2020, 05:41 AM #14
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    Quote Originally Posted by led0321 View Post
    Y’all go back and forth...Gas HD vs Diesel HD...

    Shit stresses me out lolz


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    Have you ever heard anybody with a 3/4 ton diesel say, man I really wish I’d have gone with the gas motor?

    No, you haven’t, unless they had a sex change......


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  15. 01-10-2020, 05:44 AM #15
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    Quote Originally Posted by FEETDOWN View Post
    Have you ever heard anybody with a 3/4 ton diesel say, man I really wish I’d have gone with the gas motor?

    No, you haven’t, unless they had a sex change......


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    Pretty sure dudes on this forum have...


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  16. 01-10-2020, 06:14 AM #16
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    Quote Originally Posted by led0321 View Post
    Pretty sure dudes on this forum have...


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    Have you bought a truck yet

    You will drive yourself crazy trying to buy the “right” truck.
    More fuel = more boost!!
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  17. 01-10-2020, 06:15 AM #17
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    Quote Originally Posted by KRT View Post
    Have you bought a truck yet

    You will drive yourself crazy trying to buy the “right” truck.
    No. Still waiting for orders. Wife wants a camper now so I have the green light.


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  18. 01-10-2020, 06:18 AM #18
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    You leaning towards the Ram?
    More fuel = more boost!!
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  19. 01-10-2020, 06:23 AM #19
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    He needs to go drive a 6.7.....


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    Quote Originally Posted by Mars Bluff View Post
    Only thing we need to be wearing in this country are ass whippings & condoms. That'll clear up half our issues.
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  20. 01-10-2020, 06:25 AM #20
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    Quote Originally Posted by KRT View Post
    You leaning towards the Ram?
    No, mileage is horrible and have to use premium fuel. I’m back towards GM.


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