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6.6 Gas MPG

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ickyoldman Enthusiast

ickyoldman

Posted
Posted
On 9/8/2019 at 7:28 PM, SierraHD17 said:

Weird.  I easily get the 14-15 mpg average with my 2017 6 liter 3/4 ton.  That's all highway as there is no urban anything here.  And my truck is leveled, 295/60/20 tires and 4.56 gears....

Don't see how......

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kenny_r
kenny_r

The one thing they got right though is putting the large fuel tanks on the 6.0 HD’s because I’d hate to fill up every 80 miles [emoji23]

i82much
i82much

have you ever heard of the “Internet?”

Cowpie
Cowpie

Yeah, I am really surprised that GM felt the need to depart from 4.10. It might be from a mpg mindset, but usually that doesn't play out as neat as the folks in cubicles think they will.   

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kenny_r Enthusiast

kenny_r

Posted
Posted
This thread makes me glad I have a 6.6 diesel....
 
 
 



Not when it throws a code, de-rates and leaves you on the side of the road ruining your 3k mile camping excursion [emoji2957]
  • Like 1
redwngr Senior Enthusiast

redwngr

Posted
Posted (edited)
34 minutes ago, kenny_r said:

 

 


Not when it throws a code, de-rates and leaves you on the side of the road ruining your 3k mile camping excursion emoji2957.png

 

 

I hear ya, but running them for 12 of last 15 years I've never had one leave me on the side of the road.  :thumbs:

 

 

Edited by redwngr
  • Like 3
kenny_r Enthusiast

kenny_r

Posted
Posted

[emoji106][emoji106] for all the guys that have issues with them, there are plenty that go 100-200k miles without a glitch, usually it’s the folks running them hard.

Cowpie Senior Enthusiast

Cowpie

Posted
Posted
16 hours ago, ickyoldman said:

Don't see how......

Matter of driving style.  A driver can influence fuel economy by 33%.  Fleet studies have shown that.  Same vehicles and different drivers.

 

When I was using regular E10, I could average about 14 mpg with my 2015 2500 6.0 with slightly oversized BFG KO2 rubber and back end dropped 2"  for all miles... town, gravel, rural, highway, etc.   Highway trips of 95% highway, I could get 17-18 mpg.  Not quite getting that now due to using E30 fuel, but the cost is lower so the actual cost per mile is about the same.   About the same cost per mile if I was using a diesel getting better mpg, so since I don't need a diesel, I don't have one.  Just in my semi truck.

 

 

Colossus Senior Enthusiast

Colossus

Posted
Posted
18 hours ago, redwngr said:

I hear ya, but running them for 12 of last 15 years I've never had one leave me on the side of the road.  :thumbs:

I hear ya about the Duramax, I've had 3 of them now, 2 LMMs and a LML, but the emissions stuff (DEF/DPF) did leave me stranded once on the LML.  The DPF and DEF was the only real weak link on the the D-Max after they got the injector issues worked out on the first gen.  There are days I wish I had a gasser, yet I always go back to being thankful I have a diesel. 

  • Like 1
ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
Posted
2 hours ago, Colossus said:

I hear ya about the Duramax, I've had 3 of them now, 2 LMMs and a LML, but the emissions stuff (DEF/DPF) did leave me stranded once on the LML.  The DPF and DEF was the only real weak link on the the D-Max after they got the injector issues worked out on the first gen.  There are days I wish I had a gasser, yet I always go back to being thankful I have a diesel. 

Indeed, they both have their place and strengths. I really liked my Duramax, but once it was close to warranty, I decided to let it go and get a gas burner. For what I do, which is pull a 5th wheel and my normal driving, the gasser is fine. If we pulled more in a mountainous area, it'd be a different story. Most of our pulls are in foothills and flatlands and if I use it as a DD, it's a 2 mile each way trip. Hearing the engine turn up, especially at elevation, was the biggest thing I had to get used to when I went gasser. Having been around older gas farm equipment, I knew they liked to rev to do the job. I tell folks that laugh to take the turbo off a diesel or put one on the gasser and then compare. Then you'd have an even playing field! LOL! In jest, yes, but a difference maker for sure.

greatmizzou Enthusiast

greatmizzou

Posted
Posted

Finished a long driving trip with party of four to illinois to florida and back.   Tennesee hills highway got me like 14-15mpg.   When I was in coastal Florida on state highways (55-60mph limit)...My computer estimated over 20mpg.  
 

truck drove great, just a pain in the ass to park.

 

3500 HD crew cab 6.6 gas

 

 

  • Like 1
  • 1 month later...
Limelight Enthusiast

Limelight

Posted
Posted

I’m finding if I drive it “normally” I get better fuel mileage than if I take it super easy and try to save gas. So far, that’s been the case at least. 

 

I can can tell you as it breaks in I’m definitely starting to feel more and more power. I love this engine so far. 

  • Like 3
Carolina Enthusiast

Carolina

Posted
Posted (edited)
36 minutes ago, Limelight said:

I’m finding if I drive it “normally” I get better fuel mileage than if I take it super easy and try to save gas. So far, that’s been the case at least. 

 

I can can tell you as it breaks in I’m definitely starting to feel more and more power. I love this engine so far. 

It’s the first vehicle I’ve had that seems to get better on cruise versus manually driving it . We’ve had heavy winds all week too . I expect it to do better when the weather calms down 

Edited by Carolina
  • 1 month later...
texasnavy05 Enthusiast

texasnavy05

Posted
Posted

Posting an update with a few more fill-ups.
Truck is daily driver. 80% highway 20% urban. I hook up a 24ft livestock trailer or a 35ft flat deck about 2-3 times per month.

My DIC is consistently 1-2 mpg higher than the real mileage and my "best avg" numbers are way higher than anything I've ever gotten on a tank.

Anybody else using fuelly care to share? ae7acb5e3bb7db4052695060c33eafa5.jpg25edc196204c8d49deebf663252a9871.jpg

Sent from my SM-G892A using Tapatalk

kenny_r Enthusiast

kenny_r

Posted
Posted

So it basically get the same as a 6.0 if not worse.lol.


I guess on the flip side it is making more hp/tq but it’s also using 3.73’s instead of 4.10’s. Seems like more coulda been brought to the table.

  • Like 2
  • 2 months later...
Luke Palmer New Member

Luke Palmer

Posted
Posted

I just picked up my 2500 gas.  In the manual it states to use 93 octane (premium) for best engine performance and best MPG.  Ive read this whole thread and I am confused on if majority are using reg unleaded (87 octane) or premium.  Pricing here in Cincinnati is on avg 1.99/ gal vs 2.39/gal.  Obviously if i am towing i would use 93, I am just wondering if reg is ok or comparable in performance.   

ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
Posted (edited)
On 5/28/2020 at 10:21 AM, Luke Palmer said:

I just picked up my 2500 gas.  In the manual it states to use 93 octane (premium) for best engine performance and best MPG.  Ive read this whole thread and I am confused on if majority are using reg unleaded (87 octane) or premium.  Pricing here in Cincinnati is on avg 1.99/ gal vs 2.39/gal.  Obviously if i am towing i would use 93, I am just wondering if reg is ok or comparable in performance.   

My truck has almost 9000 miles on it, over 2000 of them towing my 42', 14,300 lb fifth wheel. The only thing I have put in it so far is 87 octane. I'm averaging 7.3 towing, 16 highway and 11.7 overall. Can't say if 93 makes a difference or not when towing, though. Perhaps others up here can shed more light on that aspect. Congrats on the new truck and enjoy!

Edited by ShotgunZ71

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