Chevy diesels what is your MPG?

[TURBS]

Originally Posted by KyDan

Donno what a 4dsc is....
She's got an 03 with the big V6. Runs great, she loves it. I was just
saying the display is a little "overly optimistic".
Some of those diesel MPGs mentioned earlier might be as well.
I know the factory isn't going to knowingly put in an error that makes
them look BAD!! If there is any error it's gonna be on the plus side.

It doesn't matter to me. 99.9% of my truck driving is with a trailer on
the back. I know some guys have to drive their trucks on a daily basis.
Unloaded MPG is important to them.
I am only concerned with loaded MPG and the reports here don't sound very
hopeful for me to get much improvement.

Ill give you my towing mpg with my sabre 5er in about two weeks.

[KyDan]

Originally Posted by RubenZ

Exactly, you put that weight on a Big Block Gasser and I guarantee your MPGS will be less than 9mpg. When Chevy had the 8.1l and 454's they were getting like 7mpgs.

What weight?
I towed my 4200 LB trailer 2000 miles with a late 07 duramax diesel and
got 10.5

I have towed the exact same trailer on the exact same route before and
got 9.5 with my gasser-- see my signature for details.

Many posting to this thread lead me to believe I can not expect much better
with the diesel.

I began this quest hoping a diesel would save me a little on fuel costs.
Looks like the main or only advantage to diesel over gas -- for me
at least-- is the honking huge increase in torque of a diesel.

Bottom line looks to me-- stay with my current rig and be happy.
OR keep the diesel and look for a used 5er in the 28 foot range but don't expect
to save any on fuel cost if I do that.

At the present time I have 2 trucks sitting in my driveway.
One of them has to go some time this summer......

[Cajun Po-Boy]

Originally Posted by f1100turbo

Ill give you my towing mpg with my sabre 5er in about two weeks.

X2...got a 4.5hr tow coming up headin to Disney...I'll get ya my revised mpg's with tuner-KyDan

[RubenZ]

Originally Posted by KyDan

Many posting to this thread lead me to believe I can not expect much better
with the diesel.

But on the other hand. My NON-Loaded MPGS are way better than my same model year gasser with 6.0l. With the 6.0L unloaded I was getting like 13mpg-15mpgs. With my diesel I get better gas mileage and better torque loaded and unloaded. Its a no brainer. The only negative right now is the price of diesel though. Kind of offsets it if you ask me though lol

[PHS79]

DPF's killed mileage plain and simple, I have lots of friends and family with diesels and all of them have said how bad the mileage is with their new trucks vs. their older trucks.

A friend that we camp with has a 29ft TT (he said it weights 8000lbs) that he tows with a 2009 2500HD CC, SB 4X4 Duramax in stock form he said it got 9.5 up to 11 mpg. Last spring he had it tuned via a EFI Live, and installed an exhaust and intake system. He now said that he is seeing 20 mpg empty and 13-14 mpg towing.

[BarryD0706]

Originally Posted by PHS79

DPF's killed mileage plain and simple. A friend that we camp with has a 29ft TT (he said it weights 8000lbs) that he tows with a 2009 2500HD CC, SB 4X4 Duramax in stock form he said it got 9.5 up to 11 mpg. Last spring he had it tuned via a EFI Live, and installed an exhaust and intake system. He now said that he is seeing 20 mpg empty and 13-14 mpg towing.

...and causing pollution. Have you seen the pictures of air quality in cities in China lately? No thanks!

[Cajun Po-Boy]

Originally Posted by BarryD0706

...and causing pollution. Have you seen the pictures of air quality in cities in China lately? No thanks!

....and not because people over there are driving Ford/Dodge/GM diesel trucks with engine modifications!

[PHS79]

Originally Posted by BarryD0706

...and causing pollution. Have you seen the pictures of air quality in cities in China lately? No thanks!

Personally haven't seen the skys in China, but lots of pictures since my wife has spent more that 7 weeks in China since last June for work. But smog and air quality over there is caused by ALOT more that just some diesel exhaust from the very limited numbers of modified trucks in the world, but thats a totally different subject....

I didn't say that deleting the DPF was a good thing, only said that with custom tunes deleting the DPF would gain a noticeable gain in mileage. Me personally I wouldn't mess with all the emissons BS, thus the reason that I have been looking for either a 99-03 7.3L Ford or 03-06 5.9L Dodge. No emissions to deal with, good-great mileage, and proven reliable. If I don't find exactly what I want, I will keep my gasser.

But to the OP, the mileage is what the new trucks are getting. It sucks, but it is what it is.

[h20ski]

Well it looks like I'm right in line with everyone else. Empty 18.6 is the best I've seen. Towing with GCW of 17960 lbs I get between 10.4 to 12.4 mpg. You will never save money on fuel, but it sure is nice to hit a large hill and not kick cruise off.

I got 8.0 mpg with a f150 5.4 ltr and a 6800 lb tt.

[Av8orLou]

Just got back from a short 460 mile trip. I have a 2004.5 2500hd with the lily. I got 10 mpg pulling 14000lbs Cedar Creek doing 62 mph going up and down the relatively small hills between Houston and Dallas. On flat land flat land like heading east out of Houston its closer to a 11 or so. I have only added a new mouth piece and put on a different muffler and removed the particle separator.

[Pitcrew18]

2012 Chevrolet 3500 dually pulling 16,000 + fiver getting 11.5 to 12 mpg between 65 and 70 mph. Truck has only 7500 mi so I hope to get slightly better once it breaks in but I dont expect much.

[keven]

I have a 2011 GMC Duramax 4 door 2wd with 90000 miles on it. I average 16 mpg empty and with my Roo 23ss it averages 15.2. The thing I hate the most is having to add Def once a month.

[jwwilson]

I have a 2011 Chevy Silverado with the Duramax/Allison combo. I pull a 2011 Carriage Cameo with a sticker that puts the GVW at 15,999. I have never had the rig on the scales. I usually tow at 60 to 65 MPH and like Herk said there are many factors that affect the MPG. I have been as high as 12.0 and lows around 9.5.

There are tuners out there for the Duramax that claim to increase the fuel mileage. I use a small automotive shop ran by a father/son for general maintenance, oil changes and rotation. His son was into the diesel thing with the big stacks, tuning and turbos. He told me to leave the Duramax alone. Most everyone that had messed with their Duramax had hurt them in some manner.

[demoore]

2011 2500HD with LML. I average 10.5 towing 13K fifth wheel. I average 20 on highway unloaded, but have gotten 22 mpg on a trip up to St. Louis. Daily driving to work is around 17mpg.

[dwaynerz]

08 lmm duramax, 2wd ccsb winter mpg hand calc avg 15.6 around town. i usually avg 20 not towing on hiway, wife has coaxed 24 out of it, but not very often. towing i recall last yr was about about 11 with a 5er i have no idea what it weighs. we travel "light" tho. we only have 35000 on odometer, so im hoping it will get a little better when it gets broken in.

[jevanb]

Originally Posted by jwwilson

He told me to leave the Duramax alone. Most everyone that had messed with their Duramax had hurt them in some manner.

He must not know the 6.6 then because I know hundreds of guys that will say otherwise, including me and I am heavy modified.

[BarryD0706]

Reminds me of taking weight-loss pills; they take the weight off and the folks selling them don't care that they sometimes shorten you life by 10 years.

[EXGMTech]

Got 12 mpg taking the 7600 lb trade to the dlr @ 62 mph

[sail2liv]

We bought a 2011 new Siverado 6.0 w 3.73....Gasser....as gas was almost a dollar a gallon cheaper and no $500 service to a diesel required....we get 10-11 mpg pulling 8500 lb 5 er.... get 18 mpg driving without trailer as long as can stay in 6th gear.....otherwise 15-16 mpg....truck is crew cab with 8 ft bed and always have stuff in back seat area and bed....truck is used mostly for towing....either 5 er or haulmark trailer....and we pull 56-58 mph to get the mileage and travel without trailer at 55-60 .....as long as you are towing less than 10k I think the gas is fine.....it is for us and a lot cheaper....purchase difference was around 13k and service is alot cheaper...
Towing mileage is more than 50% or total mileage....so we use for towing..

[racedaymechanic]

Originally Posted by puff

As already stated speed and road conditions are the MPG killers. I don't have a duramax but have a GMC with a 6.5 Turbo diesel. Towing my 14k girl she gets 10-12 maybe more depending, maybe less. I have figured out that I am not going to get there first or to the top of the hill before grandma n grandpa on a sunday afternoon drive.

It's the adventure and the drive not the speed at which I arrive. If I want speed I hop on the bike.

Thats about what I get with my 6.5, Mine is quite modified and pulls as good or better than my 2003 DMax, You can really wake those up with a few tricks and a couple $$