This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
The Forum Parts and Services Unofficial Allis Store Tractor Shows Serial Numbers History
Forum Home Forum Home > Other Topics > Shops, Barns, Varmints, and Trucks
  New Posts New Posts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


6.6 GM gas
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
Thad in AR. View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: Arkansas
Points: 9455 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Thad in AR. Quote  Post ReplyReply Direct Link To This Post Topic: 6.6 GM gas
    Posted: 17 Oct 2024 at 5:31am
Anybody have experience with these?
I’m truck shopping and looking seriously at a 2022 6.6 gas 4x4
Looking for opinions
Back to Top
Sponsored Links


Back to Top
Lars(wi) View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 14 Sep 2009
Location: Permian Basin
Points: 7207 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lars(wi) Quote  Post ReplyReply Direct Link To This Post Posted: 17 Oct 2024 at 6:03am
From what I have ‘read’(yea I know) a common theme is those engines tend to use oil. Supposedly GM issued a service bulletin claim a quart per thousand miles is acceptable.
If coupled with the 10sp automatic transmission, when pulling trailers mpg will be in the neighborhood of 10(at best), no trailer 15-17.
I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
Back to Top
DMiller View Drop Down
Orange Level Access
Orange Level Access


Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 31067 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 17 Oct 2024 at 7:16pm
Makes me FAR less than Dissatisfied with the 8mpg at 70 on the KW dragging a 17600gvwr trailer.  8.7 at 70 Bobtailing.

BIL bought a Van to haul his wife's Basket Class Materials two years ago, thought would be great, Best economy so far 13mpg.  Can barely stow all the crap she drags to shows and lessons.  His 2004 GM with the 327 4x4 never got better than 11mpg and not once towed anything.

Dodge 2500 a friend has, Hemi, slobbers along at 9.9mpg.  Uncertain how the newer RAM units fare.
Back to Top
LouSWPA View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 11 Sep 2009
Location: Clinton, Pa
Points: 24262 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LouSWPA Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2024 at 1:09pm
I have 18k miles so far on my '24, with ample trailer pulling. Milage is about 12, pulling a trailer, most of the time. Flat land 12, a little less if significant hills involved. I can't address oil use as so little milage. 
Beyond that I am very happy with the truck and the 6.6
I am still confident of this;
I will see the goodness of the Lord in the land of the living.
Wait for the Lord;
be strong and take heart and wait for the Lord. Ps 27
Back to Top
Pat the Plumber CIL View Drop Down
Orange Level
Orange Level
Avatar

Joined: 11 Sep 2009
Location: Springfield,Il
Points: 4772 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pat the Plumber CIL Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 2024 at 6:26pm
I have a 21 2500 HD 4x4 with a 6.6 gas . Works well for what I need. I only burn premium non ethanol in it as it sits in my garage for extended periods. My only complaint is Chevy waited until 2024 to pair the gas 6.6 with the Allison transmission. The duramax diesel would get the Allison where the 6.6 gas didn't. Well that all changed after I forked over a big chunk of change. If I was going to spend that kind of money again I would get that Allison
You only need to know 3 things to be a plumber;Crap rolls down hill,Hot is on the left and Don't bite your fingernails

1964 D-17 SIV 3 Pt.WF,1964 D-15 Ser II 3pt.WF ,1960 D-17 SI NF,1956 WD 45 WF.
Back to Top
200Tom1 View Drop Down
Orange Level
Orange Level
Avatar

Joined: 03 Jun 2019
Location: Iowa
Points: 1220 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 200Tom1 Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 2024 at 10:28pm
I just spoke to our local coop LP delivery man tonight. They lease 400 new GM pickups every year. He was assigned a pickup and trailer and sent to Florida with a trailer full of food to help out after the Hurricane. He said it got 28mpg going down loaded and 23 mpg coming back empty. They sell these when the lease is up. I'm going to stop in and put my name on the list.
Back to Top
200Tom1 View Drop Down
Orange Level
Orange Level
Avatar

Joined: 03 Jun 2019
Location: Iowa
Points: 1220 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 200Tom1 Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 2024 at 10:31pm
That is 18 mpg going down loaded.
Back to Top
DMiller View Drop Down
Orange Level Access
Orange Level Access


Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 31067 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct 2024 at 4:04am
Not buying the mileage. Several previous work buds had bought Duramax or Cummins powered pickups and were quite happy to note 18-24mpg in varied usage. Had them make a log and bring it in with mileage between refills and total gallons used, most were off by as much as 50% as were ‘guesstimating’ their mileage. Most achieved similar to my 7.3 PS at 12-17mpg. Angered them as I challenged them, then angered them further to have trusted the economy meter on their dash.   Were seeing Highest attained, not the overall average.
Back to Top
Thad in AR. View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: Arkansas
Points: 9455 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Thad in AR. Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct 2024 at 5:32am
I’ve been looking for a newer truck for a little over a week. Most 3/4 ton 4x4 are diesel.
I prefer a Ford 6.2 gas or a GM 6.0 or possibly the newer 6.6 gas.
I’ve looked at several 6.7 diesels.
I would consider one but still prefer a gad burner.
Everything I show interest in sells very quickly.
The prices are insane.
Click on a link and next thing you know there’s some high pressure sales man calling 13 times a day.
I’m working weekends right now. I’m gonna have to put this on hold until I can go look in person.
Not the same as it used to be.
Back to Top
Pat the Plumber CIL View Drop Down
Orange Level
Orange Level
Avatar

Joined: 11 Sep 2009
Location: Springfield,Il
Points: 4772 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pat the Plumber CIL Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct 2024 at 11:27am
70 mph on flat ground it registers 17, 18 mpg . Pulling camper lucky if I can get 10 mpg.
You only need to know 3 things to be a plumber;Crap rolls down hill,Hot is on the left and Don't bite your fingernails

1964 D-17 SIV 3 Pt.WF,1964 D-15 Ser II 3pt.WF ,1960 D-17 SI NF,1956 WD 45 WF.
Back to Top
SteveM C/IL View Drop Down
Orange Level Access
Orange Level Access


Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8239 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct 2024 at 3:05pm
Agree with Dave. The guys driving class 8 trucks claim 8-10 mpg. I say don't tell me what the computer says. Do the miles VS gallons math at the fuel pump.
Back to Top
Thad in AR. View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: Arkansas
Points: 9455 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Thad in AR. Quote  Post ReplyReply Direct Link To This Post Posted: 23 Oct 2024 at 6:08am
Yesterday I drove a 2016 Chevy 1500 4x4. It has a 5.3 motor and very low miles. I’m very tempted to buy this truck. Anything to watch for?
Back to Top
thendrix View Drop Down
Orange Level
Orange Level
Avatar

Joined: 04 Feb 2013
Location: Fairmount GA
Points: 4881 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Posted: 23 Oct 2024 at 9:45am
I had an 06 1500 with a 5.3 and it used some oil. Not as bad as a quart per 1000 but it did use some. I believe it had right at 100,000 on it when I got it so I don't know how it was driven before then. I don't remember it having a lot of get up and go but it's been gone 6 years
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
Back to Top
AllisFreak MN View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 07 Dec 2009
Location: Minnesota
Points: 1541 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AllisFreak MN Quote  Post ReplyReply Direct Link To This Post Posted: 23 Oct 2024 at 8:36pm
The 5.3 is a great engine. Especially in the 2014 and newer models. 
'49 A-C WD, '51 A-C WD, '63 A-C D17 Series III, 1968 A-C One-Seventy, '82 A-C 6060, '75 A-C 7040, A-C #3 sickle mower, 2 A-C 701 wagons, '78 Gleaner M2
Back to Top
Pat the Plumber CIL View Drop Down
Orange Level
Orange Level
Avatar

Joined: 11 Sep 2009
Location: Springfield,Il
Points: 4772 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pat the Plumber CIL Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2024 at 7:56am
Change the oil regularly and a vortec will run a long time. Problem is rest of truck will fall apart around it . Rust around wheel wells, brakes ,brake lines ,water pump, etc, etc. 5.3 is a good engine but power band is 3000 rpms. Not a lot of low end power. When I would drive out to Utah with my 2001 1500 it didn't like the inclines and transmission would constantly shift . That was my only complaint about 5.3 . Great gas mileage and not many issues.
You only need to know 3 things to be a plumber;Crap rolls down hill,Hot is on the left and Don't bite your fingernails

1964 D-17 SIV 3 Pt.WF,1964 D-15 Ser II 3pt.WF ,1960 D-17 SI NF,1956 WD 45 WF.
Back to Top
steve(ill) View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 11 Sep 2009
Location: illinois
Points: 81128 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2024 at 8:32am
the 5.3 is  basically the same size as a  327 cid engine.. The 5.3 has been around for 25 years and started out at about 275 HP... over the years it was bumped up to 295 and 310.. In the last several years it has grown to 355 HP ... NOW it has enough HP to do trailer hauling... back in 2000 - 2010, not so much.
Like them all, but love the "B"s.
Back to Top
Thad in AR. View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: Arkansas
Points: 9455 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Thad in AR. Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2024 at 2:27pm
Originally posted by steve(ill) steve(ill) wrote:

the 5.3 is  basically the same size as a  327 cid engine.. The 5.3 has been around for 25 years and started out at about 275 HP... over the years it was bumped up to 295 and 310.. In the last several years it has grown to 355 HP ... NOW it has enough HP to do trailer hauling... back in 2000 - 2010, not so much.

Yes this one is rated at 355 hp.
It comes with a factory tow package.
I bought it last night.
Back to Top
steve(ill) View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 11 Sep 2009
Location: illinois
Points: 81128 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2024 at 2:31pm
Clap  Clap... how many miles ?  What color ?  Std cab or stretch ?
Like them all, but love the "B"s.
Back to Top
Thad in AR. View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: Arkansas
Points: 9455 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Thad in AR. Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2024 at 4:37pm
Originally posted by steve(ill) steve(ill) wrote:

Clap  Clap... how many miles ?  What color ?  Std cab or stretch ?

4 door short bed 1500 Cobalt blue 4x4 Silverado with just under 100000 miles. Very clean and well kept.
Back to Top
steve(ill) View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 11 Sep 2009
Location: illinois
Points: 81128 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2024 at 4:49pm
I have a 2013 F150 -- same cab / bed setup........ Works great for what i do !
Like them all, but love the "B"s.
Back to Top
Thad in AR. View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: Arkansas
Points: 9455 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Thad in AR. Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2024 at 6:56pm
Originally posted by steve(ill) steve(ill) wrote:

I have a 2013 F150 -- same cab / bed setup........ Works great for what i do !

I don’t tow heavy loads any more.
Maybe a small tractor once in a while but that’s about it.
I still have my old 83 Ford. It will do the dirty work.
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.082 seconds.


Help Support the
Unofficial Allis Forum