6.7 Cummins programmer

[TheWidowMaker]

Is this off the computer calculation or your own pen and paper documentation? Those usually differ


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[TexasFlyer03]

Is this off the computer calculation or your own pen and paper documentation? Those usually differ


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I calculated mine.

[Josh7099]

I had a guy tell me the DEF helped with the MPG's but this is my first diesel so I don't have anything to compare to.... However, I've had warranty work on my 2013 2500 6.7 3x's and the last time they had to replace the CAT and DEF sensors. I've only used Peak DEF so I'm not sure what caused it. To the OP - I'm waiting for the warranty to expire and then I'm going to delete it and remove the DEF garbage. MY current average is 15/16 MPG but haven't tested it with a ghost trailer yet...

I have a '13 2500 4x4 as well and I just got it back from the shop a second time for the same sensors, DEF injector, and a new catalytic converter. Waiting on warranty to expire as well so I can delete all that emissions crap. All that stuff does is create problems and it makes you consume more fuel. I'm running 35" tires on mine and I'm getting 15 mpg around town. Still better than my old ford mpg I guess.

[Josh7099]

I have a 2015 cummins and was getting 21mpg on hwy until I put 35's on it....now getting 16mpg and also looking for a tuner/programmer. Any other suggestions. ..good thread.

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Exactly what happened to my 2013, I went from 21 mpg to 15 mpg and I lost a little power. I would sure Iike to have that power back, plus some more , and the mpg back.

[hoythunter02]

Exactly what happened to my 2013, I went from 21 mpg to 15 mpg and I lost a little power. I would sure Iike to have that power back, plus some more , and the mpg back.

It looks good, but I enjoyed that 20+mpg while it lasted...especially on those 300 mile trips to the lease.

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[Buck assasin]

i have a '13 2500 4x4 as well and i just got it back from the shop a second time for the same sensors, def injector, and a new catalytic converter. Waiting on warranty to expire as well so i can delete all that emissions crap. All that stuff does is create problems and it makes you consume more fuel. I'm running 35" tires on mine and i'm getting 15 mpg around town. Still better than my old ford mpg i guess.

be prepared.. I started having check engine lights on mine due to the exhaust not reading hot enough for some reason. I yanked out all that crap with a delete kit and the tricky thing is on the 13 and up is the pcm is locked so you either have to get a bully dog to unlock the truck and then an efi live tunner to program it or you can run the raceme.. The race me is what i ran with and its great no issues what so ever and tons of power.. It unlocked the truck and tuned it all with in about 4 min or so..

[Mike D]

I have a '13 2500 4x4 as well and I just got it back from the shop a second time for the same sensors, DEF injector, and a new catalytic converter. Waiting on warranty to expire as well so I can delete all that emissions crap. All that stuff does is create problems and it makes you consume more fuel. I'm running 35" tires on mine and I'm getting 15 mpg around town. Still better than my old ford mpg I guess.

Well what did you expect to happen when you went to a larger heavier tire?


"An honest government has no fear of an armed population".

[Bumpy]

Im thinking about selling my 5.9 and buying a 6.7. Im just getting too many miles on mine and worried about break downs. That said, im not excited about the 12 mpg. In for more response.

If I had a 5.9 I would not get rid of it. I'd drive that sucker till it couldn't go anymore. I rather fix minor mechanical issues than a monthly note.

[Josh7099]

be prepared.. I started having check engine lights on mine due to the exhaust not reading hot enough for some reason. I yanked out all that crap with a delete kit and the tricky thing is on the 13 and up is the pcm is locked so you either have to get a bully dog to unlock the truck and then an efi live tunner to program it or you can run the raceme.. The race me is what i ran with and its great no issues what so ever and tons of power.. It unlocked the truck and tuned it all with in about 4 min or so..

A buddy of mine runs the efi live and is very happy with it so for. If I have any more problems with the exhaust system a delete kit and tuner will be in the near future.

[Arrowslinger1]

From what I have read, the newer Dodges that are running the DEF are getting MPG's like the old 5.9's.

I have a 2014 4x4 with leveling kit and 35x12.5-20's and I get about 15 city and 20 hgwy. Before I put the bigger tires on I was getting close to 23 hgwy and about 17 city.