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How to squeeze more MPG from a cummins??

  
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How to squeeze more MPG from a cummins??

 
backwoodsboy916 backwoodsboy916
Enthusiast | Posts: 260 | Joined: 10/06
Posted: 12/23/07
12:24 PM

I need some help. I have a friend that has a Jeep right now but his dad lives in south carolina, and we're in georgia, and the commute every other week in a jeep on 33's is killing his college budget. His jeep is payed for so he's been thinking about selling it to buy a 99-04 dodge 2500. If he does get one he wants to run at least 35's, and i ran 35s on my 99 3500 for a while and still got 20+ MPG on the highway. What can he do to get more MPG, other than not lift it/buy a 2wd? Ive already told him that he could get a chip/tuner, air intake, exaust, a fitch fuel catylyst, and maybe flex-a-lite electric fan. Other than doing like they did in DP and put cardboard over everything, what else can he do? As much highway driving AND offroad driving that he does, i told him that he could lower the gears to match the bigger tires, and then add an overdrive unit and it would run lower RPMs at a higher speed on the highway, and still be geared low for off road, but he would be lucky if he could afford half of the stuff ive suggested. Im just trying to help him research this a little., he needs help. He doesnt really have the money for too many upgrades but he cant afford hes gas right now so i guess it depends on what you would rather spend the cash on. Any ideas would be great.  
2005 Dodge Ram 3500 4 Door 4Wd Longbed 6SPD manual, Silverline 4 inch exhaust,ATS Performance Exhaust Manifold, K&N Intake,CFM Intake Manifold, Edge Juice w/Attitude, Recon Smoked Roof and Fender Lights, 285/70/17 Firestone M/Ts,  MUCH MUCH MORE to come, one day...when im not so BROKE.....


Member: Blowin Smoke Gang

bluetech151 bluetech151
Guru | Posts: 1304 | Joined: 06/07
Posted: 12/23/07
10:55 PM

get a 4bt cummins put an 47RE bhind it with a Dana 241 t-case sending it to Dana 44 axles minimum prefer the dana 60 with 3.55 gearing on 35s

that should get around 30/35 MPG if he wants to do the swap in the jeep

MPG happy and off road friendly Grin  
Diesel Power: It'll eat up anything in its path and spit out pure charcoal.

JoshW3235p JoshW3235p
User | Posts: 51 | Joined: 08/07
Posted: 12/24/07
09:29 AM

spend 500 bucks on a little mazda or something..and run the lil b astard til it explodes. would be the cheapest thing..and he can keep his jeep. That's how I save fuel...got me a lil rollerskate to drive to work.  
2006 Dodge Cummins 2500Q 4x4 SLT. AEM Workhorse Induction. DiabloSport Predator  stacked w/ PowerPuck, BD Deep Transmission Pan, All Royal Purple Fluids, Line-X(Over The Rail), Access Tonneau, 5% Window Tint. Recon Bed Lights, LED Bar and Tail Lights. 17 x 9 Pro Comp 6001series with Pro Comp Extreme A/T Tires (305/60R/17), Rough Country Leveling Kit, Rancho 9000 shocks. Silverline 4in Dual Exhaust



IAFF- Local 805

bluetech151 bluetech151
Guru | Posts: 1304 | Joined: 06/07
Posted: 12/24/07
02:25 PM

or an old V-dub or civic 1996 to 2000 should get well over 30 and cost like $3000 to $3500  
Diesel Power: It'll eat up anything in its path and spit out pure charcoal.

bluetech151 bluetech151
Guru | Posts: 1304 | Joined: 06/07
Posted: 12/24/07
02:31 PM

oh yeah don't foget the farting muffler that mod will yeild 100 plus miles per gallon Grin  
Diesel Power: It'll eat up anything in its path and spit out pure charcoal.

backwoodsboy916 backwoodsboy916
Enthusiast | Posts: 260 | Joined: 10/06
Posted: 12/24/07
03:23 PM

As cool as the 4bt cummins swap would be, he has no mechanical ability and not much money to pay to have it done, and i might could do the swap but it would take months, no years.. im not bad with a wrench but kinda inexperienced. He has thought about getting a second vehicle but there's a few problems #1 he still lives at home and his parents wont let him have to vehicles #2 he would have a hard time paying two insurance payments, insurance aint cheap on anything at 20 years old (unless you do like me and buy a 1ton and insure it through farm bureau and qualify for the farmer discount, haha, dirt cheap!) I appreciate the help but we've thought about all those and he's still looking into all his different options, but i told him id try and find out what all could be done to the cummins over the next few years that would improve the gas mileage.  
2005 Dodge Ram 3500 4 Door 4Wd Longbed 6SPD manual, Silverline 4 inch exhaust,ATS Performance Exhaust Manifold, K&N Intake,CFM Intake Manifold, Edge Juice w/Attitude, Recon Smoked Roof and Fender Lights, 285/70/17 Firestone M/Ts,  MUCH MUCH MORE to come, one day...when im not so BROKE.....


Member: Blowin Smoke Gang

eweiler26 eweiler26
New User | Posts: 2 | Joined: 10/08
Posted: 10/23/08
08:40 PM

Hi, I have an 06 2500 megacab..all stock, all i did was cut muffler off, and i'm getting 15.5 mostly town, just wondering if anybody had some ideas on what i can do for better milage without spending a fortune..thanks  

2001.SCOTT 2001.SCOTT
Enthusiast | Posts: 464 | Joined: 12/07
Posted: 10/24/08
06:00 PM

what gears are in it and is it stock if not list mods that way we know where to start  
2001 dodge with 5in exhaust k@n intake with edge comp box,2in leveling, added holley blue lift pump kit member-"Blowing Smoke Gang" Ranchhand bumbers

eweiler26 eweiler26
New User | Posts: 2 | Joined: 10/08
Posted: 10/25/08
01:17 PM

Not really sure what gears are in it, I don't know a whole lot about the mechanical side of vehicles, I bought the truck from an uncle to pull my boat and it does the job, but everything in the truck is stock, nothing has been touched except the muffler coming off. I just ordered a K&N air intake, but other than that I have done nothing.  

07CrawlerHauler 07CrawlerHauler
User | Posts: 82 | Joined: 06/08
Posted: 11/04/08
02:19 AM

Well uv helped the exhaust and now uv got an intake so if u still want a little better mileage try a non aggresive chip like the Edge mileage max or the Banks otto mind I think its called. That should help out while giving you a little more power to boot.  
07Cummins5.9 Edge Hot Juice w/ Attitude, AFE Stage 2, Bladerunner, ATS Sub Zero, 5"Straight Pipe w 7" Black Miter Cut Stack, Fass 150, CP3 Dual Line,Leveling Kit, 33"Pro Comp XTreme A/Ts on Black XD Hoss 20s, AmsOil & Mag Hy-Tecs Front, Back & Under, Line-X, & A ****load Of Bass.

mikejbanke mikejbanke
New User | Posts: 1 | Joined: 01/09
Posted: 01/03/09
09:20 PM

I get consistent 25-26 mpg on my early 04 Dodge 4wd with Cummins. Biggest improvement was Diablosport Predator flash programmer($350) set on economy mode (+100 hp), also bumped up tires to  285/70R17 to increase gear ratio from stock 377's. Put in Airaid JR. air filter ($50) Next addition will be CFM intake manifold ($350) and synthetic atf in my automatic. I know I will get 30 mpg when done. I hope to do exhaust and get a canopy to clean up air resistence.I would love to hear from anyone who is getting 30+ mpg and what you did to get it.  

Profit41 Profit41
User | Posts: 84 | Joined: 10/08
Posted: 01/04/09
11:49 AM

Mikejbanke

I just bought a 08 6.7L and am getting 16-29 mpg. how did you get such high mpg? I know it's not broken in yet but am curious for the near future.  


Pat
--------------------------08 Ram 2500 6.7 k&n filter, flo pro 4" turbo back exhaust.
H&S mini maxx

BartC BartC
New User | Posts: 2 | Joined: 03/07
Posted: 01/23/09
01:56 PM

I have similar mods on my '03 Cummins 4X4 LWB QCab (straight-through exhaust, aFe intake, 285/70 tires, DiabloSport Predator set on extreme) and I get easily 26 mpg in town and ~32 on highway.  I think the best way to get higher mpg is keep speed down to 60-65 and drive smarter.  With all these modifications on our trucks these days our HP and Torque numbers are much higher than stock, so we shouldn't have to keep our engines at higher rpms for more than a few seconds at a time, once we've reached cruising speed.  I do wish a dual range or auxiliary transmission could cost less than $2600, I'd buy one.  

Profit41 Profit41
User | Posts: 84 | Joined: 10/08
Posted: 01/30/09
05:51 AM

I made a ,MISTAKE IN MY LAST posting. I'm getting 16-20 mpg with 6500 kmwich is around 4500 miles.  


Pat
--------------------------08 Ram 2500 6.7 k&n filter, flo pro 4" turbo back exhaust.
H&S mini maxx

bbowers bbowers
New User | Posts: 1 | Joined: 04/09
Posted: 04/24/09
12:16 PM

I have a 2003 dodge cummins high output, quad cab 2500, automatic tranny. I have about 125k miles on it and have an afe bladerunner intake, homebuilt 3 inch ram air tube into bottom of stock air box, cool blue hose, amsoil ea drop in air filter, amsoil motor oil in engine, 35-12.50-17 dick cepek fc 2 tires, 2 inch leveling lift on front, 3:73 axle gears, a homemade air block over the grille for aerodynamics, extang trifecta bed cover, FASS 150/150 lift pump, bullydog triple dog with outlook monitor running on performance (+94 HP), and a TS performance torque converter lock-up controller set to lock at 40 mph and unlock at 32. My tranny has a Suncoast valve body which firmed the shifts up to hard shifting, but is a good part and works fairly smooth if you stay out of the throttle. I have only added to the engine a HTB2 62/14 turbo from HTT that dumps into a Banks monster 4" turbo back exhaust. When my truck was stock with 33" tires worn 80 percent the truck got about 15.5-16 mpg around town and about 21 on the highway I think, maybe only 20.5 running 70 mph. After I have spent a fortune, it gets 18.5 around town and 20.2 on the highway at 74 mph. I think maybe the 35 inch tires may have actually hurt the fuel economy due to a 2 inch taller truck. I think with 33's I might see 21-22 on the highway, I don't know. I know the turbo dropped my egts from 1523 down to 1350 at the track and I ran a 10.08 @69 in the eighth mile at almost sea level and 70 degrees F. I have a used banks 6 gun with knob soon to be installed and am excited to see if either a tripledog stack or just the 6 gun will make better mileage yet. My dad has a bone stock 04 with a true flow foam drop in filter and 285 70 17 toyos AT, a 6 speed tranny, and no other mods and gets 22.7 mpg, so it is sickening how bad mine gets compared to his. I would say save your money on the turbo, bedcover, and exhaust unless you are towing. All my figures are running empty by the way, no  trailer, no load. I think 33' tires and no leveling lift are the way to go too for economy. The truck has lots of power and I smoked a hummer H2 with it. I estimate im making around 400 to the wheels. The six gun may bring it up toward 500 when I want it.