Go Back   DodgeForum.com > Dodge Trucks > Dodge Ram > 2nd Gen Ram Tech
Sign in using an external account
Register Forgot Password?


2nd Gen Ram Tech 1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

5.9 V8 Fuel Mileage

Reply
 
 
 
 
Thread Tools Search this Thread
  #1  
Old 05-31-2012, 09:55 PM
Big White Farm Truck's Avatar
Big White Farm Truck Big White Farm Truck is offline
Registered User
 
Join Date: May 2012
Vehicle: 1998 Dodge Ram 2500
Location: Muncie Indiana
Posts: 9
Question 5.9 V8 Fuel Mileage

I have a 5.9 V8 in a 1998 Dodge 2500. As far as I can tell I'm getting somewhere around 10 mpg, is that average or should it be getting better than that? The engine is stock right now but what are some things to do to get the fuel mileage a little better?
This ad is not displayed to registered and logged-in members.
Register your free account today and become a member on Dodge Forums!
__________________

1998 Ram 2500- 5.9 V8 Magnum -- Plenum Fix, Magnaflow High Flow Cat, 3" Flow-master Force II Exhaust, Self Made Headache Rack and Front Bumper, DMI Quick n' Easy Receiver, Firestone Ride Rite Air Helper Springs w/ Air Comp. Kit, And Lots of Lights
Reply With Quote
  #2  
Old 05-31-2012, 10:05 PM
sam_priem's Avatar
sam_priem sam_priem is offline
Veteran
 
Join Date: Jun 2010
Vehicle: 1996 Dodge Ram 1500 5.9 4X4
Location: Minnesota
Posts: 287
Sam Priem MISTER AW3SOM3
Default

thats pretty average. anything that reduces the drag on the engine will help get better mpg's. things like an electric fan, i've heard underdrive pulleys can help, and keeping your foot out of it will all help out. some say that CAI's help to get better miles but im not sure on that one since the engine is going to add more fuel due to the extra air.
__________________
1996 dodge ram 1500 5.9L 4x4. Plenum repair, gutted cat, magnaflow pipes, top end rebuild, Cloyes double roller timing chain, soon to be a CAI and some others
Reply With Quote
  #3  
Old 05-31-2012, 10:13 PM
catota catota is offline
Registered User
 
Join Date: Nov 2010
Vehicle: 2001 1500 stock 360 and 99 3.9 dakota
Location: pittsburgh
Posts: 20
Default

That's what i get around town, It's a big heavy 4 wheel drive truck I think thats pretty average.
Reply With Quote
  #4  
Old 05-31-2012, 10:35 PM
redneck_ram's Avatar
redneck_ram redneck_ram is offline
Champion
 
Join Date: Nov 2009
Vehicle: 2001 Dodge Ram 1500 4x4 QC 318
Location: Rochester, NH
Posts: 4,026
lousy_blind_eye
Send a message via Yahoo to redneck_ram
Default

i have a "heavy" 1/2 ton and i average 11.5 so your right about normal where you are.....
__________________
2004 Dodge Ram 2500, QC, 4x4, auto, Fisher Plow
2001 Dodge Ram 1500 QC 4x4 auto, built 360
Reply With Quote
  #5  
Old 05-31-2012, 10:40 PM
EFS463 EFS463 is offline
Professional
 
Join Date: Dec 2010
Posts: 170
Default

you are right on par, my old half ton 5.9 got about 12-13 so you are on track with 10 mpg on a 3/4
__________________
DD Rig: 1996 Dodge Ram 2500 4x4 Club Cab Long Bed SLT Laramie. 4x4 12v Cummins Diesel

2003 Dodge Dakota 4x2 3.9 V6 Magnum
5 Speed NV3500 3.55 gears w/ limited slip rear
Reply With Quote
  #6  
Old 05-31-2012, 10:58 PM
Ham Bone's Avatar
Ham Bone Ham Bone is offline
Champion
 
Join Date: Aug 2011
Vehicle: 01 1500(and a half?) 4x4
Location: Blacksburg, VA
Posts: 3,452
Mr Lambman
Default

I get 10 in my half Ton. But my half ton does 3/4 Ton things.

Because its awesome

Don't get dual exhaust that's loud, you'll get awful gas mileage becaus of it
Reply With Quote
  #7  
Old 05-31-2012, 11:17 PM
Big White Farm Truck's Avatar
Big White Farm Truck Big White Farm Truck is offline
Registered User
 
Join Date: May 2012
Vehicle: 1998 Dodge Ram 2500
Location: Muncie Indiana
Posts: 9
Default

I'm looking for a new exhaust because right now its just stock and is way to quiet, I've been looking around and found one from LMC Truck that is a Cat-Back Dual with Resonator Tips that replace the muffler. It claims to that it provides better low end torque and better fuel economy
__________________

1998 Ram 2500- 5.9 V8 Magnum -- Plenum Fix, Magnaflow High Flow Cat, 3" Flow-master Force II Exhaust, Self Made Headache Rack and Front Bumper, DMI Quick n' Easy Receiver, Firestone Ride Rite Air Helper Springs w/ Air Comp. Kit, And Lots of Lights
Reply With Quote
  #8  
Old 06-01-2012, 08:35 AM
dnfd737's Avatar
dnfd737 dnfd737 is offline
Veteran
 
Join Date: Mar 2007
Posts: 281
Default

The single best thing you can do it take the fan clutch and fan off, and add electric fans. After that I can say 180* t-stat cooler spark plugs and a cai helped mine a bunch oh check the plenum too.
I have a 1500 2wd quad cab 8'bed and get 17mpg with a 5.9
__________________
1999 Ram 1500
2wd extended cab
8'bed
5.9
plenum plate done!
Reply With Quote
  #9  
Old 06-01-2012, 08:42 AM
Prevost's Avatar
Prevost Prevost is offline
Amateur
 
Join Date: May 2012
Vehicle: 2000 Dodge Durango SLT V8 Magnum 5.9L
Location: Maryland
Posts: 30
prevost425 prevost425 prevost425 prevost425
Default

My V8 Magnum 5.9L get about 14, but i do alot of highway driving. But the electric fan is something im deffinetly going to look into doing.
Reply With Quote
  #10  
Old 06-01-2012, 09:55 AM
Wombat Ranger's Avatar
Wombat Ranger Wombat Ranger is offline
Grand Champion
 
Join Date: Sep 2011
Vehicle: An always changing fleet of Mopars
Location: Bonney Lake, WA
Posts: 5,618
Mark Bulger
Default

I got 14 with my truck strictly around town when I had 33's and 3.55's. That's with a stick, but also a high mileage motor that has to work pretty hard to push this thing around. Now I have 35's, and haven't regeared yet. I haven't filled up yet (probably later today) but I assume I will see a drop, especially since my speedo hasn't been corrected.
__________________
'90 W-250 Non-IC 12v/727
'91 D250 Project
'04 2500 QCLB NV5600 4x4

Last edited by Wombat Ranger; 06-01-2012 at 09:57 AM..
Reply With Quote
  #11  
Old 06-01-2012, 09:55 AM
mantisman51's Avatar
mantisman51 mantisman51 is offline
Record Breaker
 
Join Date: Jul 2007
Vehicle: 1998 Ram 1500 QC Laramie 318 c.i.
Location: Miracle Valley, AZ
Posts: 1,603
Default

This is the #1 question posted in 2nd Gen. It's really simple: The 5.9L is a big, fat, thirsty engine. When my dad was running a delivery service in a small town in BFE called Ely, NV he bought a brand new 73 Dodge Tradesman with a 360 and 727. That thing got 10 mpg on a very good day and it wasn't uncommon to get as low as 5 mpg. The point is they have ALWAYS been pigs. Check the plenum and drive like there's a raw egg under the pedal. I get ridiculous mileage(relatively) with my 5.2L(19 mpg average now-best couple tanks a tick over 20 mpg) by accelerating slowly(like 20-30 seconds to 50 mph), 45-50 mph tops and NEVER exceeding 55 mph. I don''t know if it makes any difference, but I installed platinum plugs and wires about 10k miles ago. But I'd be willing to bet that you'd never recoup the cost of anything like a CAI in mileage-it's all about how you drive. I'm semi-retired so I can drive as slow as I need to. I don't think it's practical for very many people.
__________________
John
"Sometimes adults are the biggest babies-WAAAAHHHHHHH"
Reply With Quote
  #12  
Old 06-01-2012, 10:26 AM
Augiedoggy's Avatar
Augiedoggy Augiedoggy is offline
Champion
 
Join Date: Aug 2009
Vehicle: 96 ram ext cab 4x4 that followed me home and drained my bank account
Location: North Tonawanda NY,
Posts: 2,989
Default

Quote:
Originally Posted by dnfd737 View Post
The single best thing you can do it take the fan clutch and fan off, and add electric fans. After that I can say 180* t-stat cooler spark plugs and a cai helped mine a bunch oh check the plenum too.
I have a 1500 2wd quad cab 8'bed and get 17mpg with a 5.9
I have been told a 180 stat will hurt mileage unless you have an sct tune loaded..since it runs rich until 195 degrees is reached and you will never get there with a 180... I ran both and wemt back to a 195..... with that and generation 3 injectors I'm getting the best mileage I ever have. (14-15 highway) with 35" mud tires and 5.5" of lift and 4.56 gears loaded with canoe on the roof and camping gear and passengers....
__________________
5.9, eworld stainless shorties from ebay, magnaflow cat, gibson cat back,180 stat, ebay CAI, 50mm DIY TB, 3" body 2.5" spacers, rear shackle lift, 35" mud tires/ 4.56 gears to match rebuilt LSD, aftermarket lights, inserts, Herculined rockers and bed
Reply With Quote
  #13  
Old 06-01-2012, 10:46 AM
blackbeasst's Avatar
blackbeasst blackbeasst is offline
Veteran
 
Join Date: Jun 2011
Vehicle: 1999 Ram 1500 4x4
Location: Anderson, SC
Posts: 372
Default

cai did nothing for my mileage. after the plenum and other upgrades i actually lost 2-3 mpg. granted i did get bigger tires (285 up from 265) so maybe thats where my 2-3 went?
__________________
1999 1500 4x4 5.9, 3" lift, Plenum replaced along with tune-up, Cat removed and Jeg's y-pipe installed, MT 285/75/16
Reply With Quote
  #14  
Old 06-01-2012, 10:59 AM
Wombat Ranger's Avatar
Wombat Ranger Wombat Ranger is offline
Grand Champion
 
Join Date: Sep 2011
Vehicle: An always changing fleet of Mopars
Location: Bonney Lake, WA
Posts: 5,618
Mark Bulger
Default

That and the lift would be the culprits.
__________________
'90 W-250 Non-IC 12v/727
'91 D250 Project
'04 2500 QCLB NV5600 4x4
Reply With Quote
  #15  
Old 06-01-2012, 11:05 AM
Augiedoggy's Avatar
Augiedoggy Augiedoggy is offline
Champion
 
Join Date: Aug 2009
Vehicle: 96 ram ext cab 4x4 that followed me home and drained my bank account
Location: North Tonawanda NY,
Posts: 2,989
Default

Quote:
Originally Posted by blackbeasst View Post
cai did nothing for my mileage. after the plenum and other upgrades i actually lost 2-3 mpg. granted i did get bigger tires (285 up from 265) so maybe thats where my 2-3 went?
yup that will do it... Along with about a 15hp power loss to the wheels from the bigger tires... you may see better results if you leave the od off...
what did you do to the plenum? just the plate replacement? or kegger mod? CAI isnt for mileage it allows more , cooler air for more dense molecules... thats gonna require more fuel... everyone wants more power with less fuel.... its an oxymoron in most cases and aint gonna happen with bolt ons in most cases...
__________________
5.9, eworld stainless shorties from ebay, magnaflow cat, gibson cat back,180 stat, ebay CAI, 50mm DIY TB, 3" body 2.5" spacers, rear shackle lift, 35" mud tires/ 4.56 gears to match rebuilt LSD, aftermarket lights, inserts, Herculined rockers and bed

Last edited by Augiedoggy; 06-01-2012 at 11:08 AM..
Reply With Quote
  #16  
Old 06-01-2012, 11:43 AM
dnfd737's Avatar
dnfd737 dnfd737 is offline
Veteran
 
Join Date: Mar 2007
Posts: 281
Default

I should put a thermometer on my CAI pipe. It gets really warm its made from aluminum and painted balck. I think the stock air cleaner got cooler air.......Any way my mpg went up but again it was time for a new air filter and a mouse had made a home in the old air hat causing great restriction.
__________________
1999 Ram 1500
2wd extended cab
8'bed
5.9
plenum plate done!
Reply With Quote
  #17  
Old 06-01-2012, 01:33 PM
blackbeasst's Avatar
blackbeasst blackbeasst is offline
Veteran
 
Join Date: Jun 2011
Vehicle: 1999 Ram 1500 4x4
Location: Anderson, SC
Posts: 372
Default

Quote:
Originally Posted by Augiedoggy View Post
yup that will do it... Along with about a 15hp power loss to the wheels from the bigger tires... you may see better results if you leave the od off...
what did you do to the plenum? just the plate replacement? or kegger mod? CAI isnt for mileage it allows more , cooler air for more dense molecules... thats gonna require more fuel... everyone wants more power with less fuel.... its an oxymoron in most cases and aint gonna happen with bolt ons in most cases...
yeah the plate, plug, wires, water pump, timing chain, new o2's F&R, all the goodies like that.

and i can see the 15hp loss with bigger tires. still feels a bit sluggish. but i also know the gearing is holding it back as well.
__________________
1999 1500 4x4 5.9, 3" lift, Plenum replaced along with tune-up, Cat removed and Jeg's y-pipe installed, MT 285/75/16
Reply With Quote
  #18  
Old 06-01-2012, 04:37 PM
tbone360's Avatar
tbone360 tbone360 is offline
Professional
 
Join Date: May 2012
Vehicle: 99 ram 1500 rwd
Location: victorville ca
Posts: 101
Default

Quote:
Originally Posted by Augiedoggy View Post
I have been told a 180 stat will hurt mileage unless you have an sct tune loaded..since it runs rich until 195 degrees is reached and you will never get there with a 180... I ran both and wemt back to a 195..... with that and generation 3 injectors I'm getting the best mileage I ever have. (14-15 highway) with 35" mud tires and 5.5" of lift and 4.56 gears loaded with canoe on the roof and camping gear and passengers....
Are you talking about 3 gen ram, stock injectors
__________________
99 ram 1500 Laramie Slt Sport, SB, Gas, 5.9 360 rwd. 9.25 rear end with 3.55 gears. msd 8.5mm wires, accel coil, rancho rs 5000 shocks, Hughes plenum fix, rest is stock.
Reply With Quote
  #19  
Old 06-01-2012, 07:36 PM
Dvickers08 Dvickers08 is offline
Registered User
 
Join Date: Nov 2011
Vehicle: 1997 Dodge Ram 2500
Location: North East, Ohio
Posts: 2
VickersBros
Default

I have a 3/4 ton with the 5.9 and i get 9 to 10 with nothing in it around town, Open up the exhaust with some long tube headers and about ehhhh 2.5" to 2.75" cat back and a nice free flowing intake you should get 12 to 13 maybe..... If you can keep your foot outta it
Reply With Quote
  #20  
Old 06-01-2012, 07:38 PM
HeyYou's Avatar
HeyYou HeyYou is offline
Section Moderator
Dodge Forum Moderator
 
Join Date: Apr 2010
Vehicle: 1996 Dodge Ram 2500
Location: Adrian, MI
Posts: 34,302
Default

Quote:
Originally Posted by Dvickers08 View Post
I have a 3/4 ton with the 5.9 and i get 9 to 10 with nothing in it around town, Open up the exhaust with some long tube headers and about ehhhh 2.5" to 2.75" cat back and a nice free flowing intake you should get 12 to 13 maybe..... If you can keep your foot outta it
And there my friend, is the rub. Doing those also gives ya more power... which people seem to like to play with. So, they get WORSE gas mileage.
__________________
1996 Ram 2500 5.9 EC/SB Gas, Auto, 4x4, Hughes plenum plate, Kegger mod, double roller timing set, rest is stock. For now.....
Reply With Quote
Old 06-01-2012, 07:38 PM
 
 
 
Reply




Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Join DodgeForum
Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -4. The time now is 12:27 AM.

Internet Brands, Inc.


Contact Details & Emails