i am currently getting 12.3 miles per gallon pulling or not pulling.will this get better? around 800 miles on it.
fuel mileage with duramax
- Thread starter m7john
- Start date
my 5.3L with 120,000 miles on it got better than this thing pulling the same trailer.
16.2??? chit... thats fuggin great mileage..
i was at 14.6 avg... i put the banks super scoop on and it lookslike i gained almost 1 mpg from that..
Same type of thing here. To add to it they fitted it with a small fuel tank that you can't get 300 miles out of. Everything in Montana seams to be more than 300 miles.
same here
S
Supplicate
ACCOUNT CLOSED
15.82 average. This is a total average from 4+ years of records on my LB7.
Best is over 20. Worst is ~ 8.
Best is over 20. Worst is ~ 8.
check out competition diesel forum they have all kinds of info on getting good mileage and more ponies
That's your problem!
I have an 06 Cummins, and in the owners manual, it says " Due to the nature of the construction of this engine, no break in precautions are necessary"
Put a load on it as soon as you can, vary the RPMs by shifting or going differnt speeds.
They take time to wear in, because the truck doesnt weigh 20000 lbs.
Mine took about 12000 Miles to "break in"... and it was painful... coming from a 1996 that got 18 mpg in the city to one that gets 14....
Both engines were broken in the same way, I hooked up a boat and trailer to it and headed up north, hammering on it as necessary. Neither engine used a drop of oil.
Two of our sales guys both have DMaxes, and did the same. No problem.
Also, remember that you are driving a 365 HP engine--- HP=Fuel burnt.
The tailpipe may be cleaner, but that is because it is using more fuel to do it.
I'd like to change that part of the program.
the lmm gets chitty mileage due to the dpf and the constant regen process. same with the ford 6.4 and cummins 6.7.the question i have is if they are so much cleaner at the tailpipe, why is the fuel consumption higher?is it now a larger volume of exhaust but cleaner?twin and compound turbos is where its at.ford is in the right direction with their turbo setup, just with a turd for a motor.if the manufactures don't get it figured out, i would guess a large amount of people will go back to gas.just my 2 cents
I think you answered your own question. Regen process uses fuel...on the older mechanically injected engines, they had only one fueling event.
With the additions of electronic injectors, I think they can put up to 5 or more fueling events per stroke.... makes the engine quieter, cleaner, gives more torque....
As the public we keep asking for more power, they keep giving it, but it is going to come at a cost.
My 1996 Dodge Auto was only 180 hp. The 5 speed was 210. Now they are 350 HP. Almost double the hp, and torque is up by over 50%. More fuel = more hp.
Now we are seeing trucks with two overdrives, which help on the highway.
If you drive in the city, you'll feel the pain of driving 350 hp. If they could deactivate cylinders or defuel in a diesel so that in the city it only made 150 hp, then we would see better economy, without much of a loss in performance...
i don't think we are on the same page.if they are burning more fuel there will be more emmisions volume wise.maybe cleaner but more of it.lets say we have a big ballon attached to the tailpipe of a 07 lmm and an 03 lb7.which truck will fill it the fastest @ say 1500 rpms?
K
kssnow987
Well-known member
I just put a new 2008 GMC Duramax on the road this weekend. It replaced my other 08 that was totaled after 3 months. The first had the Edge with Attitude, the new one has the Banks PDA. I'll I can say is the Banks kicks butt. Picked up mileage with the Banks and lowered EGTs by about 200 degrees. The mileage is still inder 9 pulling a trailer put super performance.
C
crestview
New member
Also tire size is huge on the duramax. They come with little cookie cutter tires and anyone who tries to fill the wheel wells will pay the price of fuel milage. I have 285's and can only get 14-16 out of my 02. I know people with stock tires are getting 16-20. Its a toss up cause i don't think chevys stock tires could get a four place trailer up a mountain pass. I guess it all comes back to "you have to pay to play."
The 03 will fill it sooner. There are more injection events in the 07 that make the burn more complete.
I have an 06 Dodge. I drive it up the hill and floor it. Black smoke, and soot is lining the tailpipe.
I have an 08 Dodge. I drive it up the hill and floor it. No smoke, and no soot at all lining the tailpipe.
I would say that the newer unit, although it is burning more fuel, is putting out less emissions. Emissions can be in the form of visible (soot, or black smoke, which is unburnt fuel) or invisible matter.
I can smell the very faint smell of diesel with my 06. On the 08, it smells like air. In fact, the air coming out of the tailpipe is cleaner than the air in LA.
By using more fuel to have a longer burn, and therefor a more efficient burn, less smoke/ less emissions, even though we are using a bit more fuel, it makes a cleaner burning exhaust. The diesel particulate filters are passive at highway speeds under load ( enough heat is being generated) but in the city, an extra bit of fuel is injected after the stroke to increase exhaust temps and burn it off. That's how the 08 Cummins works, I am guessing it is similar for the Duramax.
