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Dodge/Ram Diesel Discussions on all generations of Cummins Diesel powered Rams plus the new Eco Diesel

Cummins 6.7 mpg

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  #1  
Old 05-19-2008, 11:03 PM
megruda megruda is offline
 
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Default Cummins 6.7 mpg

I'm looking at a 2500 quad cab with the 6.7l cummins, but would like to get some real world reports on fuel economy. I think I want the 3.73 rear end. New to the forum and any help on this issue would be greatly appreciated.
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  #2  
Old 05-20-2008, 12:27 AM
agargano98 agargano98 is offline
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Default RE: Cummins 6.7 mpg

you can expect 13 - 17 avg depending on your driving habits. once you get 20,000 - 25,000 miles on it you will start seeing an increase
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  #3  
Old 05-20-2008, 12:30 AM
megruda megruda is offline
 
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Default RE: Cummins 6.7 mpg

Anyworse if it's 4wd?
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  #4  
Old 05-20-2008, 12:53 AM
sabersix sabersix is offline
 
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Default RE: Cummins 6.7 mpg

Typical for me is 15/17 city/hwy.
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  #5  
Old 05-20-2008, 09:12 PM
24ssm 24ssm is offline
 
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Default RE: Cummins 6.7 mpg

i just bought one like 3 to 4 weeks ago and i got like 13 to 14 on the hwy and 15 to 16 city but i just put a intake and exhaust on it and now im getting 18 to 20 in city and 16 to 17 on the hwy
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Old 05-20-2008, 09:45 PM
mopar1973man mopar1973man is offline
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Default RE: Cummins 6.7 mpg

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ORIGINAL: 24ssm

i just bought one like 3 to 4 weeks ago and i got like 13 to 14 on the hwy and 15 to 16 city but i just put a intake and exhaust on it and now im getting 18 to 20 in city and 16 to 17 on the hwy
Even in my 2002 I do much better in the city as long as you keep a light foot.. With mixed driving around here I can pull a good 21-23 MPG now... The trick is to keep your pyrometer below 600*F and boost below 5 PSI and 20+ MPG's will happen...
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Old 05-20-2008, 09:45 PM
BiggBlu601 BiggBlu601 is offline
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Default RE: Cummins 6.7 mpg

averageing about 14-15 on hwy. Not quite sure about the city cause i dont drive to much inside the city.
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  #8  
Old 05-20-2008, 09:50 PM
firemedic740 firemedic740 is offline
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Default RE: Cummins 6.7 mpg

24 thats impressive! How do you get less mileage on the highway? 20 in the city? I just topped off I put 231 miles on the trip and added 13.1 gallons of fuel so 231/13.1=17.6 mpg. Funny thing is the overhead says 16.1. I just put on the H&S dpf delete and have had no regens- thank god! I have been mostly highway by the way about 70% hwy.
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Old 05-20-2008, 09:56 PM
Az2500Cummins08 Az2500Cummins08 is offline
 
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Default RE: Cummins 6.7 mpg

24ssm I think you have your city/highway MPG backwards, unless you are listening to the Lie-O-Meter. I have 6,942 miles on my 6.7, and I get about 17 highway, and 13-15 city depending on how many times my engine goes into regen, driving habits and all that crap. I have MBRP cool duals, and it did nothing for performance. The only way you will see any improvement with an exhaust mod is to get rid of the Cat and DPF all together, only if you ware willing to sacrifice your warranty and like the color amber on your dash. I still have the stock intake, but I took out that huge plug in the stock pipe. I didnt gain any noticable power of fuel efficiency increase, but I can hear the turbo alot more now. I have a 2 1/2 inch lift and 35 inch tires,from which I gained a MPG from, and 200 RPM less at 65 MPH. I lost a couple MPG in the city though. I have the 6 speed manual. I am about to go in for my first official oil change. Gonna get an oil analysis as well. I will let yall know what I find. Oil change is not due for another 3,000 miles or so, seeing that they changed my oil at 3400 miles due to that oil leak I had.
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Old 05-20-2008, 10:02 PM
mopar1973man mopar1973man is offline
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Default RE: Cummins 6.7 mpg

123,907 - 123,558 = 349 Miles

349 Miles / 14.893 Gallons = 23.43 MPG

The wind drag on these truck is impressive... But its really surprising to reduce the speed and watch the MPG climb rapidily. Here is a simple write up I did in regards to MPGs...
http://mopar.mopar1973man.com/2002-d...-mpgs/mpgs.htm

Here is my fuel logs...
http://mopar.mopar1973man.com/2002-dodge/2002-dodge.htm
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  #11  
Old 05-21-2008, 05:50 AM
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nomolos1 nomolos1 is offline
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Default RE: Cummins 6.7 mpg

I got about 20 to 21 at 65 to 70 mph. I have an Edge Comp on my 01. I will get more once I get the truck back from my mechanic. I did some cool things to it.
Fire ringed the block, Elec fans, built trans,tranny cooler,super 40 turbo, full 4" exhaust, cryo treaded pistons and 2nd rings (may have been a waste of Money) ARP studs, oil cooler, K and N. I should be getting lower egts. My next step (next year) hopefully will be the gear venders overdrive unit. My goal is to see 30 mpg with 4.10 gears. I'm sure it has been done. I just don't want to sacrifice power to do it. So may I can make the engine work less.
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  #12  
Old 05-21-2008, 08:37 PM
Joel_MD Joel_MD is offline
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Default RE: Cummins 6.7 mpg

Hey Megruda, welcome to the forum. I bought a 2007 2500 4x4 about a year ago. It has the G56 manual trans and 3.73 gearing. In 14,000 I have averaged exactly 15.3 MPG. When you ask the question about MPG, take the answers with a grain of salt. Some guys calculate their MPG every time, but some use the overhead readout which is usually higher than reality. I track my fuel consumption and odometer readings on an Excel spreadsheet. Here is a link to it. I haven't updated the linked file since April, but you get the idea.
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  #13  
Old 05-23-2008, 05:35 PM
thejohnny thejohnny is offline
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Default RE: Cummins 6.7 mpg

I have averaged 13.473 miles per gallon since buying the truck in December. I have about 6900 miles on it as well so this isn't bad considering the 37"x13.5"x20" wheel and tire combo with the 6" lift.

Anyway, sucks that gas prices are so high but what can you do?
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  #14  
Old 05-23-2008, 06:42 PM
Az2500Cummins08 Az2500Cummins08 is offline
 
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Default RE: Cummins 6.7 mpg

Quote:
ORIGINAL: nomolos1

I got about 20 to 21 at 65 to 70 mph. I have an Edge Comp on my 01. I will get more once I get the truck back from my mechanic. I did some cool things to it.
Fire ringed the block, Elec fans, built trans,tranny cooler,super 40 turbo, full 4" exhaust, cryo treaded pistons and 2nd rings (may have been a waste of Money) ARP studs, oil cooler, K and N. I should be getting lower egts. My next step (next year) hopefully will be the gear venders overdrive unit. My goal is to see 30 mpg with 4.10 gears. I'm sure it has been done. I just don't want to sacrifice power to do it. So may I can make the engine work less.
Notice the Subject: Cummins 6.7 MPG, not 2001 5.9.
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  #15  
Old 05-24-2008, 11:55 AM
Diesel Man Diesel Man is offline
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Default RE: Cummins 6.7 mpg

Joel_MD,

That spread sheet is sweet. I wish I tracked like that from the start. I have about 33K on my truck and get 16.21-16.85 MPG/HWY( hand calculated)when driving on flat roads in Texas. I pretty much drive on the hwy. Last weekIdrove 60mph (babying)for 1 tank just to see what the mpg was, and it turned out to be 17.68mpg (Hand) this was the best I've ever had. I felt kind of stupid driving like a granny but I saved some money on that tank. It just depends how heavy your foot is.
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  #16  
Old 05-25-2008, 06:48 PM
thejohnny thejohnny is offline
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Default RE: Cummins 6.7 mpg

Diesel Man, that's not bad at all brother. I wish I was getting that kind of mileage.
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  #17  
Old 05-25-2008, 11:34 PM
24ssm 24ssm is offline
 
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Default RE: Cummins 6.7 mpg

i have 1955 miles on my truck and with me going to work and home i drive 65 and i get 17.1 now and in town not acting like a fool i get 19 but i also have a 6 speed and i shift at 1500 which is low but im saving money but i was also told by my local dealer that the less rpms the mor mpg u will get it does work and the new intake and exhaust i got has worked on mpg its like 4 more than stock but its better than nothing and the sound on the 4inch dpf back its not loud sitting but it does give u a little rumble going down the road
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  #18  
Old 05-25-2008, 11:40 PM
Az2500Cummins08 Az2500Cummins08 is offline
 
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Default RE: Cummins 6.7 mpg

That rumble is coming from the engine, not the tailpipe.
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  #19  
Old 05-30-2008, 07:50 PM
06LQC4X4 06LQC4X4 is offline
 
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Default RE: Cummins 6.7 mpg

I also find that about 1700-1800 rpm is where things start to go downhill with respect to mileage.

If I baby the throttle and keep the RPM's down below that while accelerating and stay about 65-68 on the highway I see much better numbers (15/16 city, 18/19 highway, 14 towing 5K load)

If i start getting in a hurry all those numbers go down as much as 2-3mpg or more.
Towing at 80 is 10-11MPG with no headwind, I have gotten as bad as 8mpg at 80

I have 50K on the truck and have hand cranked the numbers since I bought it, so I note differences from tank to tank.

But don't trust the overhead. It lies like acar salesman
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  #20  
Old 05-31-2008, 06:16 PM
Diesel Man Diesel Man is offline
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Default RE: Cummins 6.7 mpg

Well I got my rig out of the dealer and they did some new TSB that just came out for all the bad apples like mine.(DPF problems). I ran througha couple of tanks and my MPG went up about 1 mpg due to the new flash.(Hand Calc). They drilled a fitting after the turbo so they can spray some solvent and clean the turbo and DPF when my CEL comes. Personally I would much rather have the DPF come off but I really don't think Dodge will do it. I might be taking it off with the "BADP DPF Delete" since they are local. I've heard about 3-4 mpg gain. I'll update you guys if so.
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Old 05-31-2008, 06:16 PM
 
 
 
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08, 2008, 2009, 2500, 67, 67l, crap, cummins, dodge, fuel, mileage, mods, mpg, oil, ram

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