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2015 Cummins fuel mileage #1963859
12/05/15 05:47 PM
12/05/15 05:47 PM
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LaSalle,IL
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magnumautoresto Offline OP
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I have a 2015 Ram 2500 diesel. 4x4 crew cab, long bed.
Just about 10,000 miles on it now.
Towing my 24' enclosed trailer with a total of about 8000-9000 LBS including the trailer and a car in it I am getting 8-9 MPG.
Last weekend I did a 350 mile trip, first half was empty, very slight head wind. Stopped and filled up before the return trip and I had used 22.4 gallons after 205 miles.
I had a 2004 Cummins before this and got much better mileage..are these things that bad on MPG now?
I honestly have not checked it without towing a trailer to compare but will be next time I do a trip with no trailer.
What are you guys getting with yours?
I would like to have some feedback before I call the dealership service department to have it checked out.

Thanks, Mark

Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1963969
12/05/15 08:15 PM
12/05/15 08:15 PM
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Kalispell Mt.
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HotRodDave Offline
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The weight nearly doubled in a decade, the body bulked up and punches an even bigger hole in the wind, emmisions standards tightened and HP went up so yeah, sounds about right for the course.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 2015 Cummins fuel mileage [Re: HotRodDave] #1964010
12/05/15 09:36 PM
12/05/15 09:36 PM
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northeast ohio
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hulmule Offline
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So I've been told also. Probably why the local body shop owner sold his and wants to buy my 2006 Mega cab with a 5.9 . Question? how fast were you driving. My truck mileage really drops when I go over 2000 RPM. empty of towing


1969 Dodge Coronet R/T Convertible
1979 LiL Red x2
2012 Yellow Jacket
2006 mega cab
1977 Trailduster
1979 Trailduster
Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1964094
12/06/15 12:26 AM
12/06/15 12:26 AM
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LaSalle,IL
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magnumautoresto Offline OP
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Never over 72 and usually 70. If it goes into 6th gear rpm is 1600. If I keep it in 5th then 2000 rpm. Once it goes into 6th gear it seams to have no power to keep it above 70 mph. Once the 2004 trucks converter locked up it was a pulling machine....

Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1964096
12/06/15 12:34 AM
12/06/15 12:34 AM
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LaSalle,IL
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magnumautoresto Offline OP
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I can only imagine what the mileage would be towing a 20000 + lb fifth wheel trailer...

Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1964144
12/06/15 01:36 AM
12/06/15 01:36 AM
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CA, Proprietor; The "PALOMINO"...
dynotune440 Offline
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CA, Proprietor; The "PALOMINO"...
All I can say is I Lemmon Lawed a 2011 6.7 3500 stick 4x4....loved the truck, but 6.7 drank fuel like crazy.... have another 5.9 stick, and its gonna be around as long as it possibly can be....


Dinuba, California, Home of the PALOMINO ranch and 440 truck farm, where dodge trucks have a home. Have Four 1979 dodge PALOMINO trucks now.
Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1964150
12/06/15 01:42 AM
12/06/15 01:42 AM
Joined: Aug 2005
Posts: 5,993
Salem
Grizzly Offline
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violin

I can't possibly feel sorry for anyone since it's been common knowledge that Cummins fuel mileage took a dump in '03.laugh2

For those that STILL refuse to listen, Google "REAL WORLD fuel mileage (insert your year here) Cummins Dodge" and read until you pass out. Loaded or unloaded, you'll find it all.

Even my '02 Cummins was not that great on fuel and I had every trick in the book on it:

60 hp Edge

3.55 gears

and 285 rubber.

Best that Cummins got was 16 to 17mpg empty and hell, I'm getting that out of my current 360 Mag with electric fan and dual exhaust with the catalytic converter cut out.

And before it gets brought up, if I want to pull 10,000 pounds I'll put a V10 in it. And still pay less than a glorious Cummins. twocents I can twin-turbo it too, no problem, it's been done.

But, on another note: 9mpg towing a 10,000 pound barn door is about normal so don't bother your dealer. I got 7 mpg with my Magnum at 14,000 GCWR pulling a 27' holiday trailer. Yep, I got passed on every hill, but who fricken cares? I made it to my destination about 10 minutes behind the diesels, whoop-de-do. eyes

So, enjoy your new Cummins. Waste of 11 grand as far as I'm concerned unless you are loaded both ways, 24-7, which, again, is common knowledge. shruggy


Mo' Farts

Moderated by "tbagger".
Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1964330
12/06/15 01:22 PM
12/06/15 01:22 PM
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N.W. Florida
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Fat_Mike Offline
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Sounds about right. My dad's '07 3500 Ram, 6.7L Cummins, 6 spd manual, 4X4, crew cab, long bed gets about 9 MPG towing his 40' travel trailer, but he doesn't mind keeping it around 75...sometimes 80 MPH on the interstate. He gets about 15 MPG unloaded. He thought it would do a little better once broken in, and maybe it will. He bought it new, and it still has less than 30K miles on it.

Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1964416
12/06/15 04:23 PM
12/06/15 04:23 PM
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Stinnett, Tx
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rumblebee4232 Offline
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I have a 2014 1 ton crew cab dually, it gets 17 unloaded and 7 towing my 38 foot Raptor toyhauler.. my 06 would get 20 on highway usually on a trip to Washington state and back it got 24, towing it was around 12..

Re: 2015 Cummins fuel mileage [Re: rumblebee4232] #1964498
12/06/15 07:27 PM
12/06/15 07:27 PM
Joined: Jan 2003
Posts: 6,570
San Francisco Ca
SCATPK Offline
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My 03 2500 quad cab 4x4 long bed 6spd ho gets a solid 20+ unloaded on the highway and 16/17mpg towing a flat bed car trailer with 4000+lbs at 65/75 mph.This is with a smarty jr set on performance setting #3. Truck has 373 gears and 1 size larger than factory equipped tires, truck has 130,000 miles on the clock.

Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1964503
12/06/15 07:34 PM
12/06/15 07:34 PM
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LaSalle,IL
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magnumautoresto Offline OP
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I would think a 38 foot toy hauler is way heavier than what I am towing and my mileage would be 10-12 mpg. I googled real world mileage as suggested and most claim 10-12 in similar situations as mine.
I have had the trailer booked up for 4800 of the 10000 miles according to my dash trip odometer so ya, it is used enough to warrant the diesel in my mind.
Don't see the 11 grand premium you say for it. Those mods you had to to use yours are not free and the additional resale I'll get help make up for what I paid to have it.
Last truck lasted 12 years and 250000 miles but reliability was getting to be a concern so had to step up. Did not want to but had to be done.

Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1964737
12/07/15 01:30 AM
12/07/15 01:30 AM
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Wichita
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GY3 Offline
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My '09 4 door shortbed 4x4 2500 had DPF delete, egr delete and a tuner installed before I bought it.

It NEVER shifts out of 6th pulling a loaded car trailer even on the steepest hills!

Pulling a car trailer with a car and an extra engine in the bed full of parts the 6.7 got 15 mpg. On the highway it always gets over 20 mpg when empty and not towing. Hand calculated!

It weighed 7,500 lbs. crossing the scales at the landfill with me and my son the other day. (He weighs 150 and I weigh 200.)

Re: 2015 Cummins fuel mileage [Re: GY3] #1964828
12/07/15 11:38 AM
12/07/15 11:38 AM
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Round Lake Beach, Illinoisy
Rhinodart Offline
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That is why I bought the meager little 2015 5.7 Hemi this time. catfight I have 13K on it so far with 5K of that towing open and enclosed trailers. With my open trailer and a 98 Dodge van a couple weeks ago I got 9.5 mpg towing into a headwind from Little Rock, AR to Chicagho. Right after I bought it I towed my 32' LQ trailer with a new Challenger in it to the Mopar Nats and Moparfest and got 8.5 MPG, so it was pretty much the same as my 2004 Cummins truck. I do have to tow with the overdrive off or it gets worse mileage. The upside is fuel is MUCH cheaper! biggrin


The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

A-Body's RULE!
Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1965016
12/07/15 05:37 PM
12/07/15 05:37 PM
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Kalispell Mt.
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HotRodDave Offline
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Grizzly and Rhinodart experience is exactly mine.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1966466
12/09/15 07:01 PM
12/09/15 07:01 PM
Joined: Feb 2003
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Manitoba, Canada
DaytonaTurbo Offline
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Manitoba, Canada
Every generation of cummins pickup has got worse mileage than its predecessor. 12 valves did good, then mpg went down a little with the 24's. Went down more when the 5.9's went away and has been chugging down since.

Re: 2015 Cummins fuel mileage [Re: Grizzly] #1969133
12/13/15 09:11 PM
12/13/15 09:11 PM
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(Central) PA
Runner2go Offline
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Originally Posted By Grizzly
violin

I can't possibly feel sorry for anyone since it's been common knowledge that Cummins fuel mileage took a dump in '03.laugh2

For those that STILL refuse to listen, Google "REAL WORLD fuel mileage (insert your year here) Cummins Dodge" and read until you pass out. Loaded or unloaded, you'll find it all.

Even my '02 Cummins was not that great on fuel and I had every trick in the book on it:

60 hp Edge

3.55 gears

and 285 rubber.

Best that Cummins got was 16 to 17mpg empty and hell, I'm getting that out of my current 360 Mag with electric fan and dual exhaust with the catalytic converter cut out.


I just bought a 2003 2500 4x4 long-bed with the HO (305hp version) 3.73 gears, and drove it home from Oklahoma to Mid state PA empty. Lowest it clocked was 18.9 and highest was 21.2, all hand calculated... the over head said 20.5 to 21.5 for the most part, so not too far off. Lowest reading was actually the flat lands section of I70 & best was the 300mile up/down hill section of WV & PA shruggy

This truck still has a bone stock cummins,(no edge or even CAI) and still has the original factory exhaust. But it does has 285 rubber on it which seemed to knock few rpms off. 70 on the GPS seemed to be about 67-68 on the dash speedo.

Sure beats the 11-13mpg I get out of my old 98 Ram with a near dead gas hog 360 in it...
So I'm more than happy. boogie


1966 383, 4-sp Charger 38yrs
1970 440+6, 4-sp Road Runner 36yrs
1974 360, auto Challenger 25yrs,in Family 41yrs
2003 Ram 2500 QCLB 4x4 Cummins HO
2010 5.7L R/T 6sp Challenger - Mopar10
2018 392 Daytona Charger
Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1969139
12/13/15 09:20 PM
12/13/15 09:20 PM
Joined: Aug 2005
Posts: 5,993
Salem
Grizzly Offline
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Salem
Where in the world have you been, Man? shock

We need you in our "stock market challenge" on here!! wink


Mo' Farts

Moderated by "tbagger".
Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1969155
12/13/15 10:06 PM
12/13/15 10:06 PM
Joined: Jun 2006
Posts: 12,066
(Central) PA
Runner2go Offline
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Runner2go  Offline
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Well you know how touchy some folks are around here... whistling
So I'll stick to the shadows for a while... coffee

Re: 2015 Cummins fuel mileage [Re: magnumautoresto] #1969253
12/14/15 01:13 AM
12/14/15 01:13 AM
Joined: Nov 2010
Posts: 736
Middle TN.
4x4 Roundup Offline
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Middle TN.
Originally Posted By magnumautoresto
I have a 2015 Ram 2500 diesel. 4x4 crew cab, long bed.
Just about 10,000 miles on it now.
Towing my 24' enclosed trailer with a total of about 8000-9000 LBS including the trailer and a car in it I am getting 8-9 MPG.
Last weekend I did a 350 mile trip, first half was empty, very slight head wind. Stopped and filled up before the return trip and I had used 22.4 gallons after 205 miles.
I had a 2004 Cummins before this and got much better mileage..are these things that bad on MPG now?
I honestly have not checked it without towing a trailer to compare but will be next time I do a trip with no trailer.
What are you guys getting with yours?
I would like to have some feedback before I call the dealership service department to have it checked out.

Thanks, Mark


My experience with a 2015 3500 SRW SB Crew 4x4 w/Aisin tranny is high teens empty...put a covered GN trailer behind it and it very near cuts mileage in half and very little difference if trailer is loaded or not... twocents


WANTED-- DEAD or ALIVE:
'70 Duster--- VS29H0B274908-----UPDATE---ENGINE BLOCK FOUND---Still looking for the B-5 car.
'79 Power Wagon W14JE9S137761 or 763
Re: 2015 Cummins fuel mileage [Re: Grizzly] #1969749
12/14/15 10:26 PM
12/14/15 10:26 PM
Joined: Jan 2004
Posts: 3,837
Central Missouri Fort Leonard...
mopar65 Offline
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Central Missouri Fort Leonard...
Bs I had a 2000 ctd 4x4 with the NV4500 trans. It had 100 hp bully dog injectors and a tst comp box.oh it also had.3.54 gears. I really miss that truck.but any way my truck on the interstate would get 21-22 mpg easy.putting in the 100 hp injectors made a big diffrence. Oh I got 16 mpg towing my wife's 98 dodge durango back from Kansas runing 70-75 would of got better I think if I kept the speed around 60 to 65.

Ok next truck I had was a 2004 quad cab 4x4 with the 5.9 and NV5600 trans. It had 3.73 gears.that truck was 100 percent bone stock.I towed my 3600 pound 65 Plymouth to kana city race way for the weekend.I live around 2.5 hours from there and I have a lot of hills etc.but back on track it was hot that day and I was having charging problems on the 65 plymouth.so I used the truck all weekend to keep cool and charge the car battery.even used the truck to drive around town. I never filled the truck up till after I got home and got 19.6 mpg. All these mpg figures were all done pin to paper.by that I mean I didn't go by what the over head said.

Ok next truck 2009 dodge crew cab 4x4 with the six speed auto.it had the dpf delete 5 inch turbo bax exhaust and a 500 hp EFI tune.I was on winter fuel and would get around 19 to 20 with it but didn't do much towing with it.

My 2011 3500 dully 4x4 crew cab long bed got the worst fuel milage of any of my trucks.it was deleted tuned etc and just driving on the intetstate it would only get 17-18 but it didn't matter what you had behind it man would it pull.

I can't say for anybody elese but after towing with a 93 dodge 1/2 ton gas truck a 2012 chevy 1/2 ton gas truck and a ford 300 six 1/2 ton truck.after towing for the frist time with my old 2000 ctd truck I will never go back to a gas rig. But that's just me if a gas truck is what you like more power too you. Also on towing 10,000 pounds the most I have ever heard was some guys getting 10-11


3520 pound race ready 1973 Street/Strip Dodge Dart - Stock stroke 440/727 10.49 @ 125.0 on 93 pump gas & ET Street Radials. More to come... ( SGT Miller) Proudly served 12 years in the US ARMY RESERVES support our troops
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