MPG vs new trucks - Page 2 - Dodge Cummins Diesel Forum
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post #13 of 28 (permalink) Old 10-08-2019, 11:04 PM
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Has to be something like that as well as more transmission gears and numerically lower rear end gears.

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6.7 power... 26~28 mpg with a peak of 30+ IIRC... deleted with his custom programming.

https://www.cumminsforum.com/forum/0...snt-dream.html


saw some of his monthly logs, 23~24 every tank with some towing IIRC.

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post #14 of 28 (permalink) Old 10-09-2019, 01:17 AM
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So I got motivated to have a look at all my receipts that I have on hand (some are stashed in a pile somewhere) and for the last 20425 miles, averaged 21.137 mpg. I can see in the data where things turned south with a wrong turn in the tuning. Since fixing it I have 1 tank done, one that took me on a pot holed dirt road up to a trailhead, an hour in & 50ish minutes out plus 2200' elevation gain. that was 21.5 tank and included minimal eco driving (maybe 1/4 of the fuel used). In that data were several road trips that had DGAS tanks included in them. Lots of 75~85 mph speeds over long stretches. During that time frame, the front 2nd air dam I made was not installed, I believe that mod is good for ~1 mpg at higher speeds. Last year, similar trip on the same roads, driving the same way, I managed 19's, this past year was 17~18's. It did however also have a different tune and the rear bumper mod was missing this year whereas it was present last year.

anyways...
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post #15 of 28 (permalink) Old 10-09-2019, 02:09 AM
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Also the newer trucks run higher rail pressures, and more advanced injectors. The newer injectors can fire more times per stroke than the older ones for a more efficient burn.

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post #16 of 28 (permalink) Old 10-11-2019, 04:40 PM
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To OP. I don't know any newer trucks that get better mileage than I get. That doesn't mean they can't or don't, the peeps I know who have them arnt even close. I read the thread Steve posted and its quite impressive. As of right now, I can do over 800 plus miles per tank at 55mph easy. Keys to this,
Tire pressure I. E. Max the fronts, at least 65min. Rear.
Weight, with my 2wd, qc sb, with weight removed, I'm at 5950lbs. with a 1/4 tank of fuel.
Speed, anything over 60mph is killing you.
From a stop, never go over 6/8 pounds of boost, ever.
Tuning, fo sho, it truly does help tons, I just have a old smarty jr set on kill( max on all settings except torque management). Just abideing by those will help your mileage YUGE. From there, its the devil in the details like Steve has done exceptionally well.

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post #17 of 28 (permalink) Old 10-13-2019, 02:12 PM
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post #18 of 28 (permalink) Old 10-13-2019, 05:37 PM
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Quote:
Originally Posted by VADERPOWER View Post
Weight, with my 2wd, qc sb, with weight removed, I'm at 5950lbs. with a 1/4 tank of fuel.
Speed, anything over 60mph is killing you.
No wonder you guys get such good fuel economy, my truck is 5360 on the rear axle and 5120 on the front . I run 80-85 when on the hwy and can squeeze 13 out of mine

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post #19 of 28 (permalink) Old 10-13-2019, 05:45 PM
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No wonder you guys get such good fuel economy, my truck is 5360 on the rear axle and 5120 on the front . I run 80-85 when on the hwy and can squeeze 13 out of mine
you sir need that 2nd front air dam... i suspect, no proof though, that it is good for 1 mpg at high speeds... $30-35 in parts @home depot...

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post #20 of 28 (permalink) Old 10-13-2019, 05:48 PM
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I put a Laramie bumper cover which is around 1-1/2” lower than the factory bumper and rigged the factory air dam to it mainly for looks but hoped it would help also . Got 35” mud tires which don’t help either .
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post #21 of 28 (permalink) Old 10-13-2019, 05:51 PM
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My 04, 3500 dually nv5600, is getting 19.5 mpg with no trailer on. (55-60mph). It weighs 8500# empty. Now up the speed to 70- 75, it'll drop some. But I come from the gasser gm truck world, with a truck weighing same amount, I was getting 7-10mpg. Also my 2nd gen 360 Dodge truck only got 8-9mpg.

So I'm happy as can be with this 5.9 Cummins truck at the moment. (This #9000 dually gets same mpg as my wife's Lexus rx300&#x1f609

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post #22 of 28 (permalink) Old 10-13-2019, 05:51 PM
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MPG vs new trucks-934934ee-840f-4b1f-bb48-00e0c6c8ecb7.jpg

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post #23 of 28 (permalink) Old 10-15-2019, 09:41 PM
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My old 90 12v gets 22 mpg normally. On highway about 23 if I keep it at 65. Towing goes down to 16 or less.
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post #24 of 28 (permalink) Old 10-17-2019, 02:41 PM
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Quote:
Originally Posted by GNR View Post
Just wondering why the new trucks with more power and more emissions seem to be more fuel efficient than the good ole 5.9?

I have a 2006 with slightly over sized tires (about 32" BFG AT KO's), drive the speed limt and the best I have ever gotten is about 18/19mpg on the highway.

THanks.
I want to see the new trucks that are actually getting better mileage than an apples to apples good ole CR 5.9. They are a fallacy, just like the guys who get 25mpg in their CR 5.9s, it's all relative. Throw the same bull chitters on mpg with new trucks with the group of bull chitters with older trucks and it all balances out.

Yes the old 12Vs and early 24Vs were more miserly, you could also outrun them with a model A ford too. CR engines a bit less mpg. 2008 emissions through 2010/2013, big hit in mpg. DEF trucks, mpg back to similar to CR 5.9s. That's what i see has happened.
The newer more powerful engines actually aren't quite as good on fuel, but other refinements (def, programming, more trans gears and higher rear gear ratios, primarily, secondary things like front CAD) have allowed the new trucks back into 5.9 CR mileage territory.
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