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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 06-06-2010, 01:35 PM   #51 (permalink)
TDMAX07
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I get 19 ish most of the time on the highway which I think is good and every once in a while I'll see 21. I do not really try all that hard to get good fuel mileage but I drive my truck sensible most of the time. I think advertising a mpg number that was hyper miled is insane. There are gonna be some people that buy the new ford just for the 25 mpg or 29 mpg claim. That's a problem just waiting to happen to ford when true mpg doesn't break 19 mpg. I would not want a diesel truck with a 3.31 gearing with 20" wheels. I wish I had 4.10's in mine now. These trucks are made to pull heavy stuff and get reasonable mpg. I do think the current diesel trucks should get better mpg, but I doubt we will see 25 or 29 mpg from normal driving and the average person.

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Old 06-06-2010, 01:43 PM   #52 (permalink)
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The reason for the increase in mpg in the 2011s lies mainly in the changes to the emissions system. In the LMMs, some exhaust gas is recirculated through the engine to reduce oxides of nitrogen, which in turn produces additional soot. As a result, the DPF requires a regeneration cycle more often than would be the case if there was no exhaust gas recirculation.

In the 2011s, the addition of a new SCR (selective catalytic reduction) catalyst to the DPF reduces the need to recirculate exhaust gasses through the engine. Instead, the SCR breaks down the oxides of nitrogen by utilizing the ammonia formed from the urea injected into the exhaust stream. This in turn means that more clean air and fuel can go into the engine instead of recirculated exhaust gasses, and greater power and torque can be developed in the engine.

The frequency of regenerations is also reduced, which enhances fuel economy even further.

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Old 06-06-2010, 06:52 PM   #53 (permalink)
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Quote:
Originally Posted by Ted308 View Post
Well if people like diesel with fuel economy i bought my wife a tdi jetta that gets 48 at 75. Just not concerned about mileage on my truck because i know that same model in gas motor would be a lot worse with all the stuff I put on a truck, so put me in the teens and I am happy.
I did the same - my wfe rolls a 2003 TDI Jetta wagon - 51mpg if she doesn't let me drive (having the manual makes me wan to drive it like a sports car) - 43-47mpg when I get a couple laps in.

On the trip home from the dealer, my wife was doing ~75 w/o cruise, and the DIC said 18mpg when we got home (in our 2010). My 2005 would've been similar, from experience, which is nice. I just need to keep it in the 17-18mpg range.

100% diesel at my place - DMax, TDI & my '83 K5.

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Last edited by Down8; 06-06-2010 at 06:54 PM.
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Old 06-06-2010, 11:13 PM   #54 (permalink)
Ted308
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Quote:
Originally Posted by Down8 View Post
I did the same - my wfe rolls a 2003 TDI Jetta wagon - 51mpg if she doesn't let me drive (having the manual makes me wan to drive it like a sports car) - 43-47mpg when I get a couple laps in.

On the trip home from the dealer, my wife was doing ~75 w/o cruise, and the DIC said 18mpg when we got home (in our 2010). My 2005 would've been similar, from experience, which is nice. I just need to keep it in the 17-18mpg range.

100% diesel at my place - DMax, TDI & my '83 K5.

-bZj

Hahahah I hear you on the sports car part, put the 17's on the tdi, so the handling on curves is great. If chevy drops the 4.5 in a 2500 suburban I am all over it, for now we have settled with the 6.0 on the 2500 suburban for a travel vehicle only gas i will ever own!!
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