mpg input wanted
< Samantha...my Co-Pilot
Joined: Dec 2001
Posts: 768
Likes: 11
From: Fallon, Nevada
My dad installed one on my old Toyota when I was in high school and taught me how to use it. When I pressed down on the accelerator, the vacuum on the engine would increase and the gauge showed it. I learned how to "feather" the gas pedal to significantly improve my mpgs on that old import.
< Samantha...my Co-Pilot
Joined: Dec 2001
Posts: 768
Likes: 11
From: Fallon, Nevada
I think our Diesel Trucks are going through a stage similar to what gasoline engines did back in the 70's and 80's, when increased emissions caused many reiability/driveability concerns and poor fuel economy. Look at the economy and power gasoline engines are capable of now. I think as technology marches on that diesel engines will improve both in power and economy...I think 20's are well within reach. These engines will have much more complicated systems ( we won't want to work on them...at least most of us) and I think aftermarket tuners will have a tough time improving on them. Time will tell.
Post Fiend
Joined: Apr 2004
Posts: 5,158
Likes: 35
From: North of Salt Lake City
Not to nitpick here...but as you depressed the accelerator the manifold vacumm should have decreased...if the guage was reading vacumm it would read less vacumm as you got into the throttle more. Just wanted to clear that up. Manifold guages were great to monitor demand on the engine...and thereby improve economy.
Elder User
Joined: Apr 2010
Posts: 664
Likes: 0
I know on another post somebody asked me about what type of cleaning its doing. It doesnt say if its active or not. Or whatever the term was. Just says its doing it.
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
The two systems are completely separate. The DPF filters soot and particulate matter from your exhaust. The DEF is used in a catalytic reaction to reduce NOx.
Regenerating the DPF involves pulsing the injectors on the exhaust stroke of each cylinder in order to raise EGTs to near 1200 degrees in order to burn off soot accumulated in the DPF.
It will burn more fuel, but will not use more DEF.
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Senior User
Joined: Feb 2010
Posts: 158
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With almost 800 miles on mine i have been getting between 23 and 24 on the highway with cruise control at 70mph. At night i can get almost 25 when the a/c is turned off and just running vent.
Ive still been told atleast 1000miles before the motor is fully broken in. Some people ive talked too have said there 6.4's they got the best milage at the 2500mile point.
So i guess in a month or 2 i will see if i can manage 25+@70mph
Ive still been told atleast 1000miles before the motor is fully broken in. Some people ive talked too have said there 6.4's they got the best milage at the 2500mile point.
So i guess in a month or 2 i will see if i can manage 25+@70mph
I really wish I had a 6.7 to around to even think about test driving. I did see a few 2011 super duties at our local ford dealer but I didnt go check to see if any were diesel
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
I do not, but the way I understand it DEF is used very slowly the entire time the engine is running.
The 6.7L engine uses some different engine control settings that vastly improve efficiency. Two that I can think of off the top of my head are vastly reduced EGR as well as advancing the ignition timing. Both of these make it easier to make more power as well as helping efficiency. The downside is that the engine produces quite a bit more NOx this way.
The SCR exhaust aftertreatment system is what makes this possible. It converts the NOx after it leaves the engine before it leaves the tailpipe. So the way I understand it the SCR system(which uses DEF) is active the entire time the engine is running.
The 6.7L engine uses some different engine control settings that vastly improve efficiency. Two that I can think of off the top of my head are vastly reduced EGR as well as advancing the ignition timing. Both of these make it easier to make more power as well as helping efficiency. The downside is that the engine produces quite a bit more NOx this way.
The SCR exhaust aftertreatment system is what makes this possible. It converts the NOx after it leaves the engine before it leaves the tailpipe. So the way I understand it the SCR system(which uses DEF) is active the entire time the engine is running.
Elder User
Joined: Apr 2010
Posts: 664
Likes: 0
Its a 6.7. Picked it up 2 weeks ago tuesday.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
"Cleaning exhaust filter" came up on me like 5x yesterday. Seems like the more milage i get the quicker its cleaning the filter.
I know on another post somebody asked me about what type of cleaning its doing. It doesnt say if its active or not. Or whatever the term was. Just says its doing it.
I know on another post somebody asked me about what type of cleaning its doing. It doesnt say if its active or not. Or whatever the term was. Just says its doing it.
Did you drive it long enough for the regen process to complete, or did you shut the truck off in the middle of a regen process?
Elder User
Joined: Apr 2010
Posts: 664
Likes: 0
I know the first time it came up yesterday i turned it off shortly after. But one of them i know the truck was on atleast 10min after. the 2nd time it was on for maybe 45min after. i didnt pay that much attention on the others.
As for milage when its doing a regen, I never reset it to check. Ill try to keep that in mind for in the future tho when it pops up to reset and see compared to what i had before.
As for milage when its doing a regen, I never reset it to check. Ill try to keep that in mind for in the future tho when it pops up to reset and see compared to what i had before.