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Tractor Transporting Discussion Forum

New 6.6 Duramax and 6.7 Cummings

Author  [Modern View]
Cliff S

12-22-2013 21:21:09
70.192.133.34



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How are these engines holding up and what Fule milage everyone is getting?




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varmint

02-07-2014 15:16:16
216.237.70.109



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
Quoting Removed, click Modern View to see

don't kno the anser to your ques. but i was glad to have hip boots on by the time i got to the end of page numbr 2



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rustyfarmall

02-08-2014 07:57:20
208.126.186.41



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to varmint, 02-07-2014 15:16:16  
Quoting Removed, click Modern View to see

I pull on my hip waders everytime this discussion comes up. The guy who is claiming 60mpg empty and 75 mpg loaded is just about as believable as any of the rest.



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Ben C

01-02-2014 11:10:10
216.173.170.178



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
Cliff, I currently drive a 2013 GMC 3500 dual wheek 4x4 duramax/allison, 3.73 gear, loaded pulling my 26 ft trailer grossing 20k fuel mileage is 11.5 mpg over 26000 miles to date, running empty no trailer 16 is the best , my third duramax, 200,000 miles plus on the other two, an 04 and an 07 absolutely no problems, love the exhaust brake on the new one. Fuel mileage was best on the 04, all stock.

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Larry Baker

12-24-2013 17:45:04
204.116.154.203



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
Got a '13 4 dr. 5500 and if you stay under 70 gets around 15 but if you push it past that you may as well go 85 cause it doesnt make much difference then.Loaded it get around 10-11 and that at the 65 deal also.Has plenty power but the days of my ole 7.3 and 20 or so are gone for sure



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John M

12-24-2013 13:45:28
209.213.28.157



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
I can tell you what my 08 6.6 was getting, which was on average 15 through out the year, but I didn"t have the Urea injection. My buddies 2010 with urea gets about the same. IF I had known the 5.3 in the 1500 was going to be WORSE, I would have got another one. My 08 was stolen, and I didn"t get enough from insurance to get a diesel.



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PretendFarmer

12-23-2013 19:14:54
70.188.162.167



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to 1206SWMO, 12-22-2013 21:21:09  
Now I know your just screwing with us.



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farmer boy

12-23-2013 21:08:34
199.167.109.42



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to PretendFarmer, 12-23-2013 19:14:54  
I wouldn't be so sure he's screwing with us.

By the way, I talked with the chip manufacturer. They said that a batch of chips went out with bad software. They re-flashed it via the internet and now I get 60mpg empty and 75mpg towing.



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8v92guy

12-23-2013 17:47:17
72.70.229.190



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
08 dodge 6.7 14-15 mpgs around town 18-21 on highway if I drive like a little old lady . friend has 2013 dodge same kinda mpgs. my father has 2012 HEMI rides like bricksh#@house and sucks gas.



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PretendFarmer

12-23-2013 17:40:37
66.87.125.138



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to mkirsch, 12-22-2013 21:21:09  
That's nothing. My hemi gets 50mpg unloaded and 40mpg ttowing 30,000 lbs.



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farmer boy

12-23-2013 10:29:58
199.167.109.42



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
Just buy a Hemi. Bestest truck ever.



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G1355

12-23-2013 16:36:37
67.224.60.152



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to farmer boy, 12-23-2013 10:29:58  
Best not bestest, rather than that you said everything right. Or you could just buy a dodge.



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farmer boy

12-23-2013 17:00:32
199.167.109.42



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to G1355, 12-23-2013 16:36:37  
You've converted me. I'm so convinced I went and bought a powerwagon today. Then I bought a chip for it that gave me an extra 250hp and 300 lb ft of torque. It's so amazing. I out pulled every diesel pickup on the road. I was towing 30,000lbs and I beat a 600hp semi pulling 25,000lbs up an 8% grade. When empty I get 19 mpg, and 11 mpg towing through the mountains.



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G1355

12-23-2013 19:10:13
67.224.60.152



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to farmer boy, 12-23-2013 17:00:32  
Lol! If you supercharge it you'd get that much more power, but it takes about 5,000-7,000



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PretendFarmer

12-23-2013 10:50:27
192.249.47.207



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to farmer boy, 12-23-2013 10:29:58  

farmer boy said: (quoted from post at 19:29:58 12/23/13) Just buy a Hemi. Bestest truck ever.


yea yea yea, heh heh heh.....get a Hemi Beavis...
This post was edited by PretendFarmer at 10:51:52 12/23/13.



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David G

12-23-2013 09:37:01
204.29.138.33



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
He is asking about new.



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caseyc

12-23-2013 08:08:43
75.102.189.131



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
I personally have a 2007 Dodge with the 6.7 Cummins. I have all the emissions stuff removed. When driven like a car it will run around 18-20 mpg locally. I have gotten 22-24 mpg on long trips. When pulling a load, which it does often, it will range anywhere from 10-16 mpg depending on the load. The truck has 326,000 miles on it. Engine and trans are original. T-case was replaced at 320,000 miles due to operator error.

I service several 6.6 gm's in my shop. Many are in the '05-'10 range. Several have 100,000+ miles with one in particular, an '07 that has 230,000 on it. He uses it hard. Drive train is original. He runs 16-18 mpg empty and 10-14 mpg loaded. The others are all in that range too.

Casey in SD

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Cliff S

12-23-2013 06:33:02
70.192.129.48



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
Any one have a 2013 or 2014 GM or Ram to give mpg and reports on durability?



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AScheele

12-22-2013 21:28:40
162.72.41.145



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
Oh, and i own a Powerstroke, with 4.10 gears. just so G1355 knows that ahead of time.



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AScheele

12-22-2013 21:25:53
162.72.41.145



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 21:21:09  
CUMMINS! There is no G in Cummins.



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Cliff S

12-22-2013 22:51:37
70.192.133.34



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to AScheele, 12-22-2013 21:25:53  
Sorry but darn smart phone will change the spelling on ya sometimes to what it thinks is correct!



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larryanderson

12-23-2013 02:03:34
99.196.155.104



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to Cliff S, 12-22-2013 22:51:37  
I have had a new Ford and have a new Dodge and they both get about 8/10 pulling a 32ft gooseneck with one tractor with cab.Without trailer driving normal 15MPG is tops.Many people claim more but that's what I get.They both have plenty of power just too many pollution devices to steal mileage.I have had older Powerstroke and Cummins that got about 25% better mileage but not as much power.We don't chip or change them as it is costly and can void warranty.

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T in NE

12-25-2013 17:07:48
75.239.57.116



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to larryanderson, 12-23-2013 02:03:34  
Before the EPA stepped in there was a few dealers doing full deletes on the Dodge trucks so it was still covered as a dealer-installed option.

I guess the Duramax guys open up the computer and make changes inside it to delete.



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Brian Jasper co. Ia

12-28-2013 21:07:10
166.181.81.229



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to T in NE, 12-25-2013 17:07:48  
The only way you might get a dealer to install a delete is if there were no plates on the truck and you sign a statement that you"d never operate it on the highway again. If the EPA were to get wind of any shop removing or otherwise rendering any emissions controls inoperative, might as well hand them the keys to the place. Either way, removing the emissions controls VOIDS the engine warranty and has never been any sort of factory or dealer option.

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PretendFarmer

12-23-2013 04:20:12
192.249.47.207



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to larryanderson, 12-23-2013 02:03:34  
Quoting Removed, click Modern View to see

my 97 12 valve cummins has gotten close to 26mph with a very light foot on the highway.

I beefed up the tranny and tuned the pump. Keeps up with new rigs now.



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T in NE

12-26-2013 22:31:02
75.238.88.117



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to PretendFarmer, 12-23-2013 04:20:12  
That's pretty easy to do with the P-pump.
With the VE's you can bump timing, or there's a spacer for under the KSB now to give more dynamic timing, with those, a 366 (3200 RPM) governor spring, and a good torque converter (Goerend or Suncoast) you actually get better fuel mileage with the extra power.

Well, you do IF you continue to keep your foot out of it.



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G1355

12-23-2013 03:26:29
67.224.60.152



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to larryanderson, 12-23-2013 02:03:34  
Your figures make sense, a lot of people claim they get pulling what you get normal driving. Just wondering what one you like more the, does the inline 6 seem to pull as good as the v8.



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larryanderson

12-23-2013 16:11:35
99.196.155.104



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to G1355, 12-23-2013 03:26:29  
Really no difference also had a DuraMax which I also liked and it got 8/10MPG.One thing about the Dodge is there is more room under the hood and the ride is excellent.All diesel trucks had poor automatics but that has been changed and they all work as good as the Allison.I had to buy manual trans until they fiqured it out but they did.



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VicS

12-25-2013 08:44:49
70.195.65.44



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 Re: New 6.6 Duramax and 6.7 Cummings in reply to larryanderson, 12-23-2013 16:11:35  
Has nothing to do with this post. Was getting my Expedition four wheel drive fixed, had to put in a used transfer case. Ran it in Auto mode in the ice and it kicking in and out wore the synchronizers out, I guess. There was a guy there who escorted wind generator blades. He had a 02 Ford 5.4 4X4 with get this 680000 same motor and trans, but had changed the seat a time or two.



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