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Busdriver

Shepherdsville Ky 40165

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Posted: 11/28/21 11:34am Link  |  Quote  |  Print  |  Notify Moderator

Wondering about the 6.6 GM gas engine. Tow weight is about 11,000 lbs. thinking about going with the gas engine next time I buy . Pro’s or con’s also wondering about fuel mileage towing. I know if you have to ask about fuel mileage shouldn’t be towing!


Busdriver 2019 2500 Chevy Duramax , - 2017 Grand Design 303 RLS

APT

SE Michigan

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Posted: 11/28/21 12:19pm Link  |  Quote  |  Print  |  Notify Moderator

Great engine mated to a good-in-2022 transmission. Both are dead reliable. I wish GM used the 10spd. Budget for 8mpg and you may be happy with 9-10mpg.


A & A parents of DD 2005, DS1 2007, DS2 2009
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2017 Subaru Outback 3.6R
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Sandia Man

Rio Rancho, NM

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Posted: 11/28/21 12:30pm Link  |  Quote  |  Print  |  Notify Moderator

We have both the 6.0 and 8.1 versions and of course they are thirsty when towing, heck they are thirsty when not towing. I would imagine the new 6.6 would be more fuel efficient than prior models mentioned above, but more than likely it still would not be as good as diesel mpg. We don't fret the decline in mpg with our gas engines since they are specifically used for RVing, they are not daily drivers and otherwise sit around waiting to be called to duty.

Best thing is we never had any issues with these engines, in fact they have never been back to a dealer, just followed periodic maintenance for lubrication, most of which I do myself. The 6.0 is used to tow our our nearly 11K# toyhauler, our 8.1 is used in our nearly 40', W24 chassis, 30K# Class A with toad. We live at 6K' and do most of our RVing in the four corner states at high elevation, our gassers have handled many of the severe inclines without issue.

FishOnOne

The Great State of Texas

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Posted: 11/28/21 03:50pm Link  |  Quote  |  Print  |  Notify Moderator

Pro's: Direct injection allow for higher compression which improves power and fuel economy

Con's: Direct injection tends to produce carbon on the back side of intake valves. Questionable long term effects.


'12 Ford Super Duty FX4 ELD CC 6.7 PSD 400HP 800ft/lbs
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Sjm9911

New Jersey

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Posted: 11/28/21 06:57pm Link  |  Quote  |  Print  |  Notify Moderator

16 hyway not towing, at speeds of 75 to 80. 11 towing a 6k trailor at 65-70. 12 around town.


2012 kz spree 220 ks
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Dadoffourgirls

China, MI USA

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Posted: 11/29/21 04:32am Link  |  Quote  |  Print  |  Notify Moderator

I had the 6.6 gas in a reg cab dually. I towed over 15k gooseneck trailer with hay. No issues. I towed my 9500lb travel trailer with no issues.

Moving from a 2019 Dmax, it will not be the same.


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Hammerboy

Zeeland, MI

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Posted: 11/30/21 08:57pm Link  |  Quote  |  Print  |  Notify Moderator

Just curious, I see you have a newer Duramax. Why trade in already? I have the same truck and love pulling with it.

Dan


2019 Chevy crew LTZ 2500 HD Duramax
2017 Wildcat 29rlx fifth wheel

blofgren

Surrey, B.C.

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Posted: 11/30/21 09:10pm Link  |  Quote  |  Print  |  Notify Moderator

Sandia Man wrote:

We have both the 6.0 and 8.1 versions and of course they are thirsty when towing, heck they are thirsty when not towing. I would imagine the new 6.6 would be more fuel efficient than prior models mentioned above, but more than likely it still would not be as good as diesel mpg. We don't fret the decline in mpg with our gas engines since they are specifically used for RVing, they are not daily drivers and otherwise sit around waiting to be called to duty.

Best thing is we never had any issues with these engines, in fact they have never been back to a dealer, just followed periodic maintenance for lubrication, most of which I do myself. The 6.0 is used to tow our our nearly 11K# toyhauler, our 8.1 is used in our nearly 40', W24 chassis, 30K# Class A with toad. We live at 6K' and do most of our RVing in the four corner states at high elevation, our gassers have handled many of the severe inclines without issue.


Both of those engines are solid as an anvil! Pretty tough to beat the LS engines. [emoticon]


2013 Ram 3500 Megacab DRW Laramie 4x4, 6.7L Cummins, G56, 3.73, Maximum Steel, black lthr, B&W RVK3670 hitch, Retrax, Linex, and a bunch of options incl. cargo camera
2008 Corsair Excella Platinum 34.5 CKTS fifth wheel with winter package & disc brakes

ksss

Eastern Idaho

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Posted: 12/02/21 10:12pm Link  |  Quote  |  Print  |  Notify Moderator

I am really happy to see they are switching over to the 10 speed with the 6.6 gas. I think that will make a big difference in towing. That should have been done when they released the engine in the first place, in my opinion.


2020 Chevy 3500 CC 4X4 DRW D/A
2013 Fuzion 342
2011 RZR Desert Tan
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Grit dog

Black Diamond, WA

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Posted: 12/03/21 09:24am Link  |  Quote  |  Print  |  Notify Moderator

^Yeah it will make GM at least competitive in the HD gasser market.

Now if GM actually dug a little deeper into their large bag of LS engine parts and assembled something (easily) that would one up the Godzilla, I think they’d be money ahead.
Or maybe their plan works and a large % of folks who buy these upgrade to a diesel, in short order, thus effectively selling 2 trucks per owner to that group.
In that case it’s good marketing.
Also have to account for how many hd gassers are private owner sales vs the very large market for govt or company trucks where the ultimate HP game is not played as much.
Given the runaway popularity with diesels in HDs, I could believe that the private owner market is smaller than the public entity/corporate market.


2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29

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