MPG
Junior User
Joined: Apr 2013
Posts: 97
Likes: 0
From: Boerne TX
Lucky you! I get the freaking things every 150-200 miles and they never come on when I'm actually driving a long distance.
Senior User
Joined: Sep 2010
Posts: 421
Likes: 1
From: League City, TX
In other words if I am on a 1500 mile trip and have driven 1000 miles, I won't see the average MPG change either as long as I don't reset the LOM. But, if I just left home (reset the LOM for the trip) and am 30 miles down the road when it decides to regen, I will certainly see the average MPG go down. I typically get 12 MPG during regen during "normal" driving conditions.
Posting Guru
Joined: Sep 2009
Posts: 2,015
Likes: 4
From: Lakehills, TX
EDIT: More info confirming what you're saying from Wikipedia:
Originally Posted by Wikipedia
Diesel engines run with a lean (overstoichiometric) air-to-fuel ratio to ensure the combustion of soot and prevent unburnt fuel from being emitted. The excess of oxygen necessarily leads to generation of nitrogen oxides (NOx), which are harmful pollutants, from the nitrogen in the air. Selective catalytic reduction is used to reduce the amount of NOx released into the air using DEF. Diesel exhaust fluid (from the DEF tank located inDiesel vehicles) is injected into the exhaust as it moves through the engine where it vaporizes and decomposes to form ammonia and carbon dioxide. With the SCR catalyst, the NOx are catalytically reduced by the ammonia (NH3) into water (H2O) and nitrogen (N2), which are both harmless and are released through the exhaust.
DEF is stored in a tank on board the vehicle, and injected into the exhaust stream by a metering system at a rate of 2% of diesel consumption volume (4-6% in Europe).
DEF is stored in a tank on board the vehicle, and injected into the exhaust stream by a metering system at a rate of 2% of diesel consumption volume (4-6% in Europe).
Junior User
Joined: Apr 2013
Posts: 97
Likes: 0
From: Boerne TX
Fire, if you never ever reset the mpg meter then the number won't change much during a regen since its using a long history of averaging. But if you reset the mpg meter at every fill up and a regen comes on it will drop that sucker by at least 1 mpg (at least that's what mine does).
My truck also like yours doesn't show any signs of a regen other than the message (well, the dropping mpg meter shows it but I don't reset the trip log anymore). Every now and then I have noticed at the end of a regen my truck will make a roar sound, kinda like a fan clutch locking up makes. I don't know the exact length of time or miles but someone told me its about 10 minutes. I seem to be getting them around every 150-200 miles.
My truck also like yours doesn't show any signs of a regen other than the message (well, the dropping mpg meter shows it but I don't reset the trip log anymore). Every now and then I have noticed at the end of a regen my truck will make a roar sound, kinda like a fan clutch locking up makes. I don't know the exact length of time or miles but someone told me its about 10 minutes. I seem to be getting them around every 150-200 miles.
Senior User
Joined: Feb 2011
Posts: 118
Likes: 0
From: Spokane, WA
My mpg has been as low as 7.5mpg and as high as 23mpg.
It really depends on what you are doing.
65 mph on a 300 mile long flat hiway will get you in the 20's
80 mph on a 300 mile long hiway drive will get you 18's
city driving will get you 13-15 mpg
Towing a large 5ver in a head wind will get you 7.5mpg.
Towing same trailer with out the headwind will get you 10.5 mpg
It really depends on what you are doing.
65 mph on a 300 mile long flat hiway will get you in the 20's
80 mph on a 300 mile long hiway drive will get you 18's
city driving will get you 13-15 mpg
Towing a large 5ver in a head wind will get you 7.5mpg.
Towing same trailer with out the headwind will get you 10.5 mpg
Head wind is much more of a factor than weight. Better mpg with a low flatbed at 13K than with a fifth wheel at 8K.
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Posting Guru
Joined: Sep 2009
Posts: 2,015
Likes: 4
From: Lakehills, TX
Fire, if you never ever reset the mpg meter then the number won't change much during a regen since its using a long history of averaging. But if you reset the mpg meter at every fill up and a regen comes on it will drop that sucker by at least 1 mpg (at least that's what mine does).
Senior User
Joined: Sep 2010
Posts: 421
Likes: 1
From: League City, TX
I reset the average MPG and trip odometer on each fill up and even if I don't see the cleaning exhaust message I can tell that it is in regen. Obviously it is less noticeable if I am getting low on fuel because of the number of miles that I have driven since filling up.
Each truck is different and driven differently, so who knows.
I get 3-5 MPG better than a friend that purchased a 2012. But, I'll confess that most of the time I drive to achieve the best MPG I can. For instance I try to time traffic lights, let off the accelerator a good distance before the I need to stop and down shift manually when approaching a stop light/sign. The theory being -- I already invested in the fuel it took to get up to speed, I don't want to invest more getting to the light/sign faster just to sit there idling while waiting for the green light.
Senior User
Joined: Jan 2013
Posts: 238
Likes: 0
From: Northern New Mexico
ScanGaugeII & Regen
I have found that besides an unusually low mpg reading on the dash display while in a regen cycle, my ScanGauge II mpg reads an unusually high mpg reading. Go figure. As soon as the regen cycle is complete the two pretty much indicate about the same value. 
Senior User
Joined: Aug 2009
Posts: 102
Likes: 0
From: MA
For instance I try to time traffic lights, let off the accelerator a good distance before the I need to stop and down shift manually when approaching a stop light/sign. The theory being -- I already invested in the fuel it took to get up to speed, I don't want to invest more getting to the light/sign faster just to sit there idling while waiting for the green light.
All modern vehicles cut fuel while coasting (above idle rpm), and this truck is real good at it with the converter being locked up above 900 rpm. The more distance you can cover coasting, the better your mileage will be. Even if you floor the diesel pedal mileage can only drop from ~20 to 0. When coasting it goes up from ~20 to infinity.
In other words, it can rise a lot farther than it can fall, and this can be used to get the average way up.
Freshman User
Joined: Oct 2003
Posts: 47
Likes: 0
From: Archer, Idaho
Yeah I sure wish everybody would use real world driving while reporting their mileage, telling people inflated numbers causes others misery. When I first came onto this site I was reading "I get 17-19 city & 19-23 hwy". I now know those numbers are bogus and many here don't do a hand calc'd real number on the entire tank. Sad, almost like telling half the story and not the whole story.
Senior User
Joined: Aug 2009
Posts: 102
Likes: 0
From: MA
To say that people that get crappy mileage are just more honest than people that get better mileage is absurd. The people that get poor mileage are always butt hurt, doesn't matter what type of vehicle or what forum it is. My GF gets pissed when I get 10 more mpg on a given route than she can, or tank average, but she doesn't call me a liar for it.
Freshman User
Joined: Oct 2003
Posts: 47
Likes: 0
From: Archer, Idaho
To say that people that get crappy mileage are just more honest than people that get better mileage is absurd. The people that get poor mileage are always butt hurt, doesn't matter what type of vehicle or what forum it is. My GF gets pissed when I get 10 more mpg on a given route than she can, or tank average, but she doesn't call me a liar for it.
