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Cummins fuel mileage?
01-15-2004, 07:17 PM
Post: #1
 
I'm thinking about picking up a late 90's Cummins for a possible plow truck and/or tow rig.

I was wondering what sort of mileage I could expect to get with a stock extended cab automatic. I just mean during normal driving, btw, not plowing or towing.

Thanks for any info.

edit: Maybe I should have read page 2 before posting this. I can't believe some of you guys are getting 20 and over. That's just insane with a truck that big. I've GOT to get me one.

Fell free to still post your mileage though.




97 Grand Cherokee TSi <BR>4.0L Quadra-Trac<BR>3\" Rncho springs<BR>31\" Cooper STT\'s<BR>RE front TB, JKS rear, OME SD40<BR>Mopar skids & hooks
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01-15-2004, 09:11 PM
Post: #2
 
Are you considering a dually? What gears are you thinking? The 3.55 gears usually yield 1-2 MPG's better than the 4.10's and the SRW trucks 1-2 better than the DRW.

It also depends a little on what year you are looking at. The early 24v's (98.5-99) were typically not the best with MPG's. My friends 99, 4x4, SRW, w/ 4.10 gears never got over 17.5, he usually got 15-16. On average the 12 valve motors seem to be a little easier on fuel. Of course there are exceptions to every rule. I have another friend that went from a 1995, SRW, 4x4 w/ 3.55 gears and he typically got 21-23 MPG's with that truck. His 00, SRW, 4x4, w/ 3.55's gets between 19-21.
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01-15-2004, 09:50 PM
Post: #3
 
My truck is a 98 srw 12 valve 4x4 cummins 5 speed and I get 20-24mpg on the highway/18-19 in town. The 5 speed will get you better mileage. Look for a late model 12 valve, they get the best fuel mileage and are cheapest to BOMB.....




98 2500 QC shortbed 4X4, 12V Cummins, 5 SPD, 255/85/16 Wild Country TXRs, Silencer Ring Removed, 4\" Pilot lights, fleetguard oil filter, K&N Air Filter, straight piped exhaust
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01-15-2004, 10:11 PM
Post: #4
 
I can get about 19mpg with 37 inch tires and 3.54 gears. The mpg is actually around 22mph though because spedometer was never recalibrated.




2001HO DDUFM DD2 Banks Exhaust Brake, Dodgezilla HX40/35, BHAF, Con OFE, 5 inch deaver coils in front add-a-leaf in rear, 37/12.5R16, warn15000 winch custom mount, FASS, 2wd low kit, Warn lights, fuel turbo and egt gauges, 4.30 gears rear detroit ARB in the front with ARB compressor, Full On-board air, Air horns Brake Smart, Rock rails, Rancho shocks, Limiting straps.
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01-16-2004, 03:26 PM
Post: #5
 
I'd want a SRW truck, I don't need a dually. As far as gears, I have no idea. They come with 4.10's or 3.54's? I guess I'd end up with whatever came in the truck. I'm talking used here. I DO think I'd prefer an auto tranny though.

After what I've read here, I'd look for a later 12V. What year did they stop making them? I honestly don't know alot about them, which is why I'm asking questions now. I probably won't be in the market for the truck till September.

Also, if I was to get a truck with 4.10's, would putting on 35" AT's improve the mileage? I know installing larger tires lowers the effective gear ratio, would the 35's and 4.10's get good economy?

And what do you mean by cheapest to "BOMB"? Do you mean mod? I know diesels can make crazy power, isn't that really big bucks though? Or are there a few low buck mods that can help power and economy?

Thanks alot for all the advice.
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01-16-2004, 06:18 PM
Post: #6
 
Quote:On 2004-01-16 14:26, Mike97ZJ wrote:
I'd want a SRW truck, I don't need a dually. As far as gears, I have no idea. They come with 4.10's or 3.54's? I guess I'd end up with whatever came in the truck. I'm talking used here. I DO think I'd prefer an auto tranny though.

After what I've read here, I'd look for a later 12V. What year did they stop making them? I honestly don't know alot about them, which is why I'm asking questions now. I probably won't be in the market for the truck till September.

Also, if I was to get a truck with 4.10's, would putting on 35" AT's improve the mileage? I know installing larger tires lowers the effective gear ratio, would the 35's and 4.10's get good economy?

And what do you mean by cheapest to "BOMB"? Do you mean mod? I know diesels can make crazy power, isn't that really big bucks though? Or are there a few low buck mods that can help power and economy?

Thanks alot for all the advice.
Get the 12v Cummins. The last year they made them was mid 1998. There are 24v and 12v 98 trucks out there so look carefully, but it is not hard to tell the difference. My dually 98 12v came with 3.54s and I have heard after a few forums on here that most of them come with the 3.54s and the 4.10 was an option, so your probably going to find one with 3.54s.
As for the choice of going to a different gear ratio, I would stick with the 3.54s if your not going to put big tires on it. I am going to go to 4.10s with my 37" tires.
The 12v are great for power and the mods are considerably cheaper than that of a gas motor. Just give it more air before more fuel. You can get fuel cal plates that go in the injection pump and provide wonders of more power, but they also increase EGTs and smoke, so a pyrometer gauge is necessary. I got the complete Banks Power Pack, it was a little pricey but it gave me over 300 ft-lbs torque and about 130 more HP. I was amazed at the increase in fuel mileage I got to as they claimed.
Get the 12v, no lift pumps to go out on you and kill your injection pump and a 12v is easier to learn about and work on IMO.




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01-18-2004, 09:22 PM
Post: #7
 
this mileage thing has me all confused, I have a 99 with 4.10's and 315's I'm getting about 14 mpg. according to the computer. I haven't recalibrated the speedo so how much is it off? Also before that I went from the stock 235/85 to a 285/75 and was still getting around 18? Shocked forgot to mention I have an auto too.




98 12v 5sp BD\'s 300hp pump Banks 4\" 16cm turbo housing 370s coming soon
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02-01-2004, 10:47 AM
Post: #8
 
I have a 99 Dodge 3500 with the 24v Cummins and I get anywhere from 25 to 28 mpg durin the summer and as bad as 19 durin the winter.
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02-01-2004, 11:09 AM
Post: #9
 
Right now my fuel mileage just sucks. Im gettin under 15mpg. But that's also due to 38's and 3.54 gears with no fuel mods. During the summer/fall i was gettin close to 18-20mpg. Once taxes come in i'll be bumpin her up pretty good with mods so hopefully that'll get my mileage back up.




Jeff<BR><BR>96 RAM 2500 4x4 CTD, 10\" lift,40\" hawgs, 4.10\'s, locked rear, AFE MegaCannon , Missing silencer ring, #5 fuel plate,<BR>5\" stacks,full gauges,,DT tracbar http://www.cardomain.com/id/gotsmoke <BR><BR>If guns cause crimes, then pencils cause mispelled words!<BR><BR>Alpha \"ooooooo, light condoms!\"
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02-11-2004, 10:20 PM
Post: #10
 
as far as BOMB/Mods go, The 12v is cheeper, i mean to pick up a quick few free ponies poke some holes in the air box and move the stock fuel plate forward, But, It all comes down to mechanical ability. The 12, to adjust timing you need soem special tools, and some time, and your stuck at that particular timing and HP rating, plus you have to know how to change it. With the 24 V Its all run by computer. So all ya do is plug in a box and it tells the engine to up the timing and fuel to make the more power. Most boxes out there will let ya choose between something like 40 hp and 90 fttq, all the way up to 160hp and 360fttq at the flip of a switch. So its kinda nice. And both will yeild aboutthe same mileage.
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