Yes, 28+ mpg isn't a dream!!!! - Dodge Cummins Diesel Forum
07.5 - 09 3rd Gen 6.7 Liter General Discussion General Chit Chat About the 6.7L 3rd generation Cummins - NO ADVERTISING

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post #1 of 532 (permalink) Old 03-29-2017, 09:35 AM Thread Starter
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Yes, 28+ mpg isn't a dream!!!!

I'll give y'all a little bit of background first. I've been tuning engines for 8 years as a hobby, grew up on a farm wrenching on gas/diesel tractors and equipment for close to 22 years, went to an engineering university for 3 years, and worked for Delphi automotive systems in engineering (specifically exhaust sensors development i.e. O2 and pm [soot] sensors) for 1.5 years (couldn't hack the cubicle life.)

A year ago I purchased an 09 2500 all stock. The fuel mileage (coming from a self-tuned 12 valve that got 28-32) was extremely poor in my eyes. I deleted with the raceme ultra and saw gains, but not enough to convince me that I should just let it be. Last week I bought the key to warp tuning.

Over this past weekend, I spent 10 hours tuning (rough tuning with my pre-made excel sheets, they are my bread and butter that model the engine combustion process fairly well.) I achieved 28.9 hand calculated from this rough tune and will probably be starting the fine tuning process this coming weekend. My end goal is 30-35, with pipe dreams between 35-50. I will NOT stop till I get to the absolute BEST efficiency possible.

Currently, I'm looking at building a program that will take the signal from the crank sensor and a pressure transducer and correlate them to "see" the combustion process inside the engine, if I can find a way to put a transducer on the head that will not compromise integrity.

I also tuned for mo powa!!!!! Lol

Didn't mean to be finger tap happy, but wanted to include as much detail as possible. I will be finishing my pickup and then doing a friends 03 soon.

The fun never ends!

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft
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Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #2 of 532 (permalink) Old 03-29-2017, 09:37 AM Thread Starter
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I know my signature is wrong, can't find a way to edit it on my phone 🤔.

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft
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Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #3 of 532 (permalink) Old 03-29-2017, 09:37 AM
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Any other modifications to the truck? Very interesting read I'm anxious to see where this leads.

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post #4 of 532 (permalink) Old 03-29-2017, 09:53 AM
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I'm curious as well.

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"09 Mega Cab. AFE dry intake. 4" Flo-Pro TBE. EFI and TCM tuning by Dave Matthews of Draconian Diesel. GDP Big Line Kit. AFE DFS780 fuel pump and filter setup. 35x12.50x20 Mickey Thompson Mtz's on 20" Gear Alloy Big Bore's.
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post #5 of 532 (permalink) Old 03-29-2017, 09:57 AM Thread Starter
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Just warp on a raceme ultra, 4 inch turbo back with stock "muffler" and egr delete. 3.73 gears, 11.5 rear end, g56 transmission. I wish I had the 3.42s, would make mileage gaining easier, but oh well. I occasionally tow up to 30k, after all this, I will be making a tow tune as well designed for mileage and power as well.

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft
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Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #6 of 532 (permalink) Old 03-29-2017, 10:28 AM
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and how are you calculating this mileage

12 Ram 2500 Laramie CCSB 4x4, 6.7, G56. Bone Stock
08 Ram 2500 QCSB 4x4, 6.7, G56. Draconian Tuned, Deleted.....SOLD
01 Ram 2500 SCLB 4x4 5.9, 6 speed...Lots of goodies 380/815...SOLD

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post #7 of 532 (permalink) Old 03-29-2017, 10:37 AM Thread Starter
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Miles on odometer/gallons pumped to brim. Speedo is calibrated to gps.

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft
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Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #8 of 532 (permalink) Old 03-29-2017, 10:52 AM
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hmm. interested in longevity. Those injectors have got to be running super lean. Last truck i ran into getting that kind of mileage had an injection pump going out, got 2 tanks around 28-30mpg, a week later all 6 injectors were toast, so were his pistons and valves.
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12 Ram 2500 Laramie CCSB 4x4, 6.7, G56. Bone Stock
08 Ram 2500 QCSB 4x4, 6.7, G56. Draconian Tuned, Deleted.....SOLD
01 Ram 2500 SCLB 4x4 5.9, 6 speed...Lots of goodies 380/815...SOLD

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post #9 of 532 (permalink) Old 03-29-2017, 11:02 AM Thread Starter
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To be honest, it takes the same amount of fuel to make x horsepower to move down the road, you reduce that not by leaning it out, but by making it more efficient at using the fuel it is given. If I need to explain that further, I will.

Longevity won't be an issue. The injectors are fine, as is pressure. I got the same mileage as everybody else, sometimes better (adjusting the nut behind the wheel is 83.8% of fuel economy 🤔.) Once I tuned the truck, that's when I saw an increase above the norm.

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft
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Record MPG: 31.2MPG Average over deleted life: 24.4MPG Next Tank Goal MPG: 35
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post #10 of 532 (permalink) Old 03-29-2017, 11:19 AM
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I've been hitting that mpg for the past ten years. Stock. Bought the truck for the work it could do, but made sure fuel economy was high. After all, what's the point of using more than necessary?

24-26 is what I average on the highway whether loaded or empty. South Central US.

19-21 in city.

14-16 towing my 35' travel trailer.

I always enjoy the "it's not possible" posts.

No, it's a matter of wanting it and doing what's necessary.

210k miles and just got second set of tires. One brake reline. Ujoints. Other than that one lift pump and an ignition switch. So, about $600 plus maintenance for a thirteen year old truck.

Oh, and about $6k total depreciation since I bought it in '07.

But, gee, no 4WD. No auto trans. No lift kit. No tuner. No death wobble and all new steering. Still on original ball joints.

Hell, with this cost structure I could have bought two of the same, run the same miles and still come out cheaper than nearly any 4WD/auto owner with his one truck.

Longest life at lowest cost with highest reliability means having a plan. Only a Dodge could have done it.

2004.0 DODGE Ram QC/LB 2500 2WD/NV-5600 305ISB. 7,940-lb. Stock. 200,000-miles/5000-hrs @ 40-mph average. 35' 9k GVWR TT. 9-cpm solo & 15-cpm towing; 21-mpg average past 54k-miles
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post #11 of 532 (permalink) Old 03-29-2017, 11:22 AM Thread Starter
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I like that, I've used 4wd once a week just getting out of the driveway. I also am in the ag business, offroad capability with payload and mileage is a concern for me. I'm not an auto either, I think being 99% efficient with a manual over having 83% efficiency with an auto is an easy choice. Haven't owned an auto in 8 years.

Either thirteen is wrong or you have a 5.9?

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2009 2500 CCSB G56 4x4, 3.73-Self tuned w/WARP 552HP & 1225 lb-ft
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post #12 of 532 (permalink) Old 03-29-2017, 11:56 AM
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well you peaked my interest. Maybe you should apply at Anarchy or some of the other tuners, i'd be interested to hear their thoughts on this @3brorce, @jonathanrayce, @davematthews

2018 Ram 3500 Limited - Crew Cab Long Box 4x4 SRW Stock at the moment, but that will change

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