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2500 HD Gas Mileage

currious to see what kind of MPG's people are getting with their Duramax trucks

Re: 2500 HD Gas Mileage

Postby fleet58 » Nov 15 2011, 11:02pm

I have a 07' new body style Crew Cab with the 6.0 and a 3:73 gear. My all around average is right at 12.9. I have got a best of 13.1 returning home from Reno, I was really stoked wit that. Truck is completely stock except next size up on tires, 265's vs 245's, Had dealer reprogram CPU for the taller tires. I have plans for Flowmaster 50 series BB muffler and maybe a CAI. Maybe I'll get 1-2 MPG if I'm lucky. :lol: Other wise, it is what it is a Tow vehicle. Good luck, and read into what most of us say here on the forum, mostly good info, but know everyone has had different results with what they've done. Rich... :)
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Re: 2500 HD Gas Mileage

Postby 2002summit » Dec 19 2011, 3:45am

Here's my data from another post:

2002summit wrote:I have been averaging 13.87 mpg (30% city 70% hwy) since April of 2010.

The truck is stock with exception of the following modifications:
Larger than stock Firestone Transforce HT LT265/75R16 tires mounted on OEM aluminum wheels replaced the LT245/75R16 tires on the original steel wheels.
K&N intake.
These mods accounted for an average increase of 2-2.5 mpg!

I am using Mobil 1 5W-30. My best average was 17.4 mpg after a 250 mile road trip (light traffic, tailwind, few stops). My worst was 11.5 mpg (mostly city, heavy traffic).
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Re: 2500 HD Gas Mileage

Postby fleet58 » Dec 21 2011, 3:41pm

Hey Summit;

You said that you gained 2-2.5MPG, is that just from the K&N install, And did you have the CPU reprogramed for the taller tires? I have a 50 series BB Flowmaster muffler coming in the next couple days, hope to get in installed before the end of the year. I'll let everyone here on the forum how my results turned out. :?
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Re: 2500 HD Gas Mileage

Postby 2002summit » Dec 22 2011, 7:51am

fleet58 wrote:Hey Summit;

You said that you gained 2-2.5MPG, is that just from the K&N install, And did you have the CPU reprogramed for the taller tires? I have a 50 series BB Flowmaster muffler coming in the next couple days, hope to get in installed before the end of the year. I'll let everyone here on the forum how my results turned out. :?


The 2-2.5 MPG gain was from the K&N intake AND swapping out the original heavy steel wheels with lighter OEM aluminum wheels. I haven't yet reprogrammed the computer for the taller tires. Plan to when I choose a programmer (leaning towards Bully Dog Triple Dog GT). I have an app "Road Trip", that compensates for tire size, so I record accurate MPG figures.

Looking foward to your results after you install your Flowmaster 50-series muffler.
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Re: 2500 HD Gas Mileage

Postby hkboss13 » Dec 31 2011, 6:58pm

worktruck2011 wrote:Diesel has lots of torque but financially right now it doesn't make any sense unless you really need to haul or pull a huge load all the time. Diesel costs ~20% more than gasoline. If you factor in the cost of the diesel engine up front and paying more for fuel, gasoline trucks win...unless they're unable to do what you need from a physical perspective.


Id have to agree. I've had my '11 2500 with the 6.0 gas for about a year now and made the same decision based on the reasons above. Not to mention that gas engines can easily get you about 200,000 miles out of your truck if you take care of it which kills the whole arguement that diesel engines are the way to go to get more life out of your truck. I own a small fleet of GM trucks (ranging from 03 - 11), a few with the 6.0's that are running north of 150k miles and have been used their whole lives for construction, and when you park those trucks next to my new one, you can't tell the difference in how the engine is running.

Oh, and im getting about 12-13mpg too so I think you'll just have to get used to that :(
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Re: 2500 HD Gas Mileage

Postby norfla71 » Jan 04 2012, 4:01pm

Second all those opinions. I have a 6.7 Cummins Ram that gets great mileage unloaded (about 20) but sinks like a rock around town, or when it goes into regen. At almost $1 more per gallon, it adds up. Not to mention the 7,500 mile oil changes ($125), 15,000 fuel filter changes (another $100) and 50,000 DPF changes (at $2,000 a pop). Compare that with $8,000 initial savings, $30 oil changes, much cheaper routine maintenance and about the same mileage towing; the fuel mileage benefit of a diesel goes out the window at this point. No contest. I also do not put many miles on my trucks anymore and the wear and tear from just sitting (water in fuel) can cost me a $20,000 engine. No thanks. I also commute a lot,backroads and city, so the diesel is just a waste of hydrocarbons. For me, the gas motor is a much more sound choice.
I had a 94 C1500 with the TBI 350; sold it with 240,000 miles on an untouched motor (internally, anyway). The LS series is now a relative old timer, considering the basic engine has been around since 97, but are still the best family of gas engines on the planet.
I like the fact that I can get a loaded SLT GMC 2500, with the 6.0, for what a base diesel lists for. And can pull my fifth wheel, at under 10,000# empty, without breakng a sweat. This fall I will be driving my new 2500, coddled in heated leather bliss.
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Re: 2500 HD Gas Mileage

Postby sadsteve » Jan 16 2012, 6:04am

I too bought a 2011 2500 HD with 6.0 vortec, 3.73, 6 speed allison automatic. My best milage has been 13, but I'm averaging 10, sometimes 9. I can always get better mileage from a truck than anyone else so it is not my driving habits. This truck is the disappointment of my life. I would never have bought it if I knew it would cost 32 cents per mile in gas to drive. I didn't know that in this day and age anyone made a new truck with such poor mileage. I've owned school buses and RV's that got this kind of mileage but never an empty, new pickup truck. There is some bad engineering between the 3.73 ratio, the allision tranny and the 6.0 engine. I hear the 8.0 gets better mileage. Is there anything I can do to improve mileage. I can sacrifice power if need be to gain some mileage. I can't find much on this forum regarding the 2011 trucks.
I am 58 years old and have owned more than 25 chevy trucks, happy with them all, but this one has been a problem. It had a cold start problem a few days after I bought it. The dealer had someone ride around in it and "get it hot" to try to reproduce the problem with no results. Duh. The second time back the service manager sat in the parking lot and put a years worth of wear on the starter by starting, killing, starting, killing the engine several hundred times, with no incident of failure. I have 2 video's I made with my phone when I was stranded in a drive through at McDonalds. The lights on the dash go off at times and then pop back on after a while. The turn by turn directions got us terribly lost when we tried it out on our first trip. It cannot find my home, says I'm 2.5 miles further down the road. I've spent hours with Onstar with no results. GM has really let me down on this one. I don't have time or money to make repeated trips to the dealer. It's $15 in fuel each time there. They say the mileage will improve around 5,000 miles which sounds crazy to me but even if true, that is $1600 worth of fuel from now. I'm stuck with a truck I don't trust and don't like. Can anyone help?
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Re: 2500 HD Gas Mileage

Postby ksss » Jan 23 2012, 12:22am

Your tranny is not an Allison. The 8.1 which I think is what your refering to as the 8.0 does not get better mileage (at least empty). My 2012 gets better than your but its not a great difference. The Ford 6.2L is not getting any better and that motor is brand new. If I were you I would wait until the new trucks are released. At a min. the new engines will be direct injected, but I would anticipate a Ecoboost type engine to be released. Your truck is under warranty so take it in and get your issues resolved.

I am not sure your being realistic in your expectations, if your complaining about the $15.00 to take it to the dealer, I think you should have gotten a half ton. If you really need a 2500HD than buck up, thats the price you pay for the added capability.
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Re: 2500 HD Gas Mileage

Postby starspangled6.0 » Jan 23 2012, 3:13am

^

The 6.0 is a really stout motor, and will do just about anything you need it to, except go easy on the gas.
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Re: 2500 HD Gas Mileage

Postby SHNOOL » Jan 23 2012, 3:38am

I have 2512 miles on my 2012 now, 6.0, and 4:10 gears. The truck gets 13.8 on flat highway... hand calculated. It gets about 11 average city/highway.

Glad to see another crew cab beast on here, with a gas engine. If it makes you feel any better, my 2500 RAM with the HEMI got 11.9 highway (flat), and 8.9 average. That was with the "better for mpg" 3:73 gears. I hear the ram boys say 4:11 gears and the MPG gets better with the HEMI though.
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