New 6.6 Duramax and 6.7 Cummings

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.
 
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.
 
(quoted from post at 11:03:34 12/23/13) 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.

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.
 
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
 
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.
 
Best not bestest, rather than that you said everything right. Or you could just buy a dodge.
 
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.
 
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.
 
Lol! If you supercharge it you'd get that much more power, but it takes about 5,000-7,000
 
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.
 
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.
 
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
 
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.
 
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.
 
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.
 
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.
 
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.
 
(quoted from post at 22:21:09 12/22/13) How are these engines holding up and what Fule milage everyone is getting?

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
 
(quoted from post at 16:16:16 02/07/14)
(quoted from post at 22:21:09 12/22/13) How are these engines holding up and what Fule milage everyone is getting?

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

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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