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Duramax Fifth Generation: 2011+ (LML) Discuss the fifth generation (2011) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 02-09-2011, 12:20 AM   #1 (permalink)
PRICELESS
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This 2011 duramax mpg is not only bs but confusing !!

All this 17-20 mpg wether its highway or city is all foreign to me . I have an 11 with 10000 miles and have always averaged 13.5 mpg with combo of city and highway driving .

I took her n earlier this week for the flash for the po299 dtc that i only got once and recieved doc2558332 bulletin reflash . I have also noticed once maybe twice the steam from under the hood passenger side but at the time didnt know ....thought maybe it was steam from it being so cold .

I guess im just wondering how this is so diverse ....from 10mpg to 22mpg .
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Old 02-09-2011, 05:36 AM   #2 (permalink)
MSA231V6
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Priceless - There is a HVAC drain hose on the right side of the firewall on the engine side - down at the bottom. If the hose is not turned towards the 8-9 o'clock position it can leak onto the exhaust and lead to steam and a faint diesel smell. Often can be noticed at slow speeds when making left turns. I had this on a truck I was driving and made it go away easily by turning the hose. Hope that might help.
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Old 02-09-2011, 06:45 AM   #3 (permalink)
TrevorD
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Anyone claiming 17-20 MPG in the city needs their head examined or needs a clear definition of city driving. The LML definitely gets better mileage than the LMM stock vs. stock, but it's still a heavy truck with a 400+ CID engine. I average 14.5 MPG pretty consistent with a mix of city and highway driving, and if there isn't a head wind (good luck in West Texas) I can manage 18-19 MPG, depending on how heavy my right foot is. FYI, I'm about to roll over 18,000 miles on my truck. I am very pleased with the mileage for a 100% stock truck that gained another 700 lb. of weight over the previous truck. It seems to average what my '08 LMM did with a tuner and exhaust. I think that's doing well considering the truck will regen once per tank of fuel!

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Old 02-09-2011, 11:04 AM   #4 (permalink)
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I have 8112 miles on my 2011 LML. I have purchased 665.1 gallons of fuel since I picked it up. That's an average of 12.2 mpg. This is all hand calculated. I have kept a log since purchase. These numbers are true and accurate for my truck. I would have to say it is a 50/50 mix of city and highway.
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Old 02-09-2011, 12:07 PM   #5 (permalink)
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Quote:
Originally Posted by KeithG View Post
I have 8112 miles on my 2011 LML. I have purchased 665.1 gallons of fuel since I picked it up. That's an average of 12.2 mpg. This is all hand calculated. I have kept a log since purchase. These numbers are true and accurate for my truck. I would have to say it is a 50/50 mix of city and highway.
My info on my OnStar app shows a lifetime MPG of 12, but half of my miles have been with a 30' or 48' trailer behind the truck.
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Old 02-09-2011, 01:10 PM   #6 (permalink)
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my info on my OnStar app shows 14mpg lifetime and 10854 miles and i live in southern California so even some of my highway mile are like city miles and i tow 36foot bumper pull toy hauler @13klbs every other weekend. I have had my truck seance November 5th 2010
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Old 02-09-2011, 01:18 PM   #7 (permalink)
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I have come to the realization that these trucks like to run....fast. In town, I'm looking at 14-15mpg. At hwy speeds of 70-75, its about 16-17mpg. For some reason, the 80-85mph get me the best mpgs......like 20mpg+. I picked up this truck on Oct 1 and just rolled 14,000 miles this morning.
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Old 02-09-2011, 02:21 PM   #8 (permalink)
fordbeater
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My truck was averaging around 20 mpg running 78 down the interstate, but at 65 I'm getting 16-18 with it just rolling over 3000 mi before I put it in storage. I'm in Idaho so those numbers depend on the wind. Wither way it is better than my LMM with Ram Air and exhaust.

I agree that these trucks wanna run, i have to use cruise on base and in town.
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Old 02-09-2011, 03:47 PM   #9 (permalink)
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interesting

Quote:
Originally Posted by fordbeater View Post
My truck was averaging around 20 mpg running 78 down the interstate, but at 65 I'm getting 16-18 with it just rolling over 3000 mi before I put it in storage. I'm in Idaho so those numbers depend on the wind. Wither way it is better than my LMM with Ram Air and exhaust.

I agree that these trucks wanna run, i have to use cruise on base and in town.
I have not hit 80 MPH yet, but I have noticed that the traditional 55 MPH that usually gets the best mileage does not with my Denali LML. Maybe the MPG sweet spot on these new LML's is closer to 80 MPH, very interesting.
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Old 02-09-2011, 03:54 PM   #10 (permalink)
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i to have seen best mpg at around 80mph. between 75 and 80 is where i run when i can and that seams to be best
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