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View Full Version : Anyone running the Cummings 5.9


Lovingreen
11-01-2010, 09:52 PM
I have heard of this engine in a 2wd 6 speed manual getting in the 20's as far as mpg???? I simply dont believe this in a 3/4 ton. I have two gassers a chevy 5.7 and a dodge 5.9....both avg from 8 loaded to 12 unloaded. I am driving 100+ miles a day so if this is true...even if less when trailering, It may make sense to look into this configuration????

bighornjd
11-01-2010, 09:59 PM
Never heard of a Cummings engine? What kind of truck would I find one of these Cummings engines in?

ohdad34
11-01-2010, 10:00 PM
I have heard of this engine in a 2wd 6 speed manual getting in the 20's as far as mpg???? I simply dont believe this in a 3/4 ton. I have two gassers a chevy 5.7 and a dodge 5.9....both avg from 8 loaded to 12 unloaded. I am driving 100+ miles a day so if this is true...even if less when trailering, It may make sense to look into this configuration????

Yes, the cummins gets that good of mileage. Stock. All the power you can ask for, also. Ran ford powerstroke to pull a 50ft. gooseneck race car trailer for years. Got a dodge and kicking self for not getting one sooner. If you do some things to it, I know guys getting high 20's. My opinion, it's definitely worth it. Maintenance and parts fairly cheap too.

olde_blue
11-01-2010, 10:04 PM
The 12v 5.9L Cummings (pre 1998.5) are supposed to get better mileage than the 24v engines, although they put out less horsepower.

lyube
11-02-2010, 12:40 AM
The 12v 5.9L Cummings (pre 1998.5) are supposed to get better mileage than the 24v engines, although they put out less horsepower.

Cummings? What's that?

John_DeereGreen
11-02-2010, 08:34 AM
To get mileage like that, it almost has to be a common rail...03 and up.

But yes, it is possible. Just don't trust the factory overhead computer.

93Chevy
11-02-2010, 09:01 AM
I don't understand why people add an unnecessary "g" to Cummins however, the "g" is often left off of other words, such as "I'm runnin' over to the store."

hosejockey2002
11-02-2010, 12:27 PM
I don't understand why people add an unnecessary "g" to Cummins however, the "g" is often left off of other words, such as "I'm runnin' over to the store."

Because about half of the U.S. population is functionally illiterate.

Evan528
11-02-2010, 06:35 PM
I get 20-22MPG on the highway with my 03 Ram/Cummins. 10-12 locally.

LandContract
11-02-2010, 07:54 PM
I saw a craiglist ad just now from a dealership selling an 06 Cummins and it was spelled with a G, just shrugged and laughed at the stupidity. Cummins is not spelled with a G!!!!!!!

2low4NH
11-02-2010, 10:24 PM
my 95 averages 20mpg with very mixed driving

jigbuilder
11-02-2010, 10:38 PM
Another 3rd gen '03 Dodge/Cummins HO 305/555 HPCR "quiet" engine that averages 21-21.5 mpg on a 600+ mile a week commute. Thats all hiway miles as I have no city to drive in out here. All pencil figures. The truck has over 180000 miles now and still pulls my 11200 gvwr 5er/a 16k tripple axle GN stock trailer/10k car hauler/etc. Our last 3800 mile trip with the 11200 gvwr 5er averaged 12.5 mpg.

Cummins made the 305/555 HO HPCR engine in '03 and '04 only. With the NV5600 6 sped manual tranny and the 3.73 axle its one of the best mpg getter in the Cummins line up.

My previous 5.9 Cummins was a 2nd gen 235/460 '01 2500 3.54 auto tranny. I averaged around 19.5-20 mpg on my same long commete. The 2nd gen engine was loud enough to kill brain cells.

My first 5.9 was a '96 3500 DRW NV4500 12v engine with 215/440 hp/torque. I had this truck was in commercial service with 28000 lb gross combined plates. Towing at those weights ran around 9-10 mpg. This truck didn't operate empty very often but would generall average 18-18.5 mpgs.

Dodge/Cummins isn't the only 2500 size diesel trucks that can run in the 20-22 mpg range. Just about all of my neighbors with the older DMAX and 7.3 PSDs run that kind of milage out here.

I'm not a diehard Dodge fan as I've owned many more GM trucks in the 2500/3500 size operating in the LTL field many years ago.