Great data from PPEI - Page 3 - Chevy and GMC Duramax Diesel Forum
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post #21 of 34 (permalink) Old 10-24-2019, 01:15 PM Thread Starter
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C'mon guys - bragging about mileage is no more reliable than bragging about the size of........well....let's not get too personal in here.....!

Yes, I have seen 30 mpg on mine. No wind, steady 50 in double overdrive, no load, on the level and then very gently down-sloping run from Prescott to Chino Valley here in the high country of northern Arizona. I have seen 4 mpg "pulling the grades" while towing our "toys".

My "daily driver" is a Toyota RAV 4 - consistently averages at 28 mpg. My Honda 50 got over 75 mpg. I don't have a dog-sled...but if I did....
Lol wouldn’t that be miles per kibble? At the end of the day it’s about value added. What that means from consumer to consumer varies dramatically, but I feel like we all enjoy saving money in some capacity.
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post #22 of 34 (permalink) Old 10-24-2019, 01:40 PM
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Any idea if the shift to emissions friendly tuning will eventually lead to more affordable tuning options? In other words will GM play ball and allow/support cracking the ecm?

2006 LBZ Chevy 2500HD CCSB 4x4, leveled 295/75R17 Nitto Ridge Grapplers, DSP 5 tuned by Idaho Rob, 248k miles - SOLD

2019 Chevy 2500HD LTZ CCSB 4X4, b&w turnover hitch, to be continued...
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post #23 of 34 (permalink) Old 10-24-2019, 02:24 PM
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Completely understand where your going here. I think any and all of us are right to question the data and how itís produced. Especially when we are spending our hard earned money based on it. Please donít take the way I worded my response to discount the products entirely. They will continue to refine the calibrations, and I think as a whole make some huge efficiency gains to the modern emissions systems. In the mean time I think itís important for us to ask questions as they come up to understand where the data came from and how itís being used.


All im saying is that if you get 1000 miles per gallon of DEF, and you're getting 20 mpg then your getting 50 gallons of diesel to 1 gallon of DEF.

If you're getting 23 MPG, and presumably an increase in efficiency produces a decrease in DEF consumption based on the statements made thus far, then you would burn 43 gallons of diesel. which would if linear equate to about .9 gallons of DEF over the same distance. so if you drive 15K a year, you will save 1.5 gallons of DEF a year maximum.

Now, lets say this tuning kit costs the absurdly low price of 500$ and a gallon of DEF costs about 3$. It would take you 160 gallons of DEF to equate to the cost of the tune, which at 1.5 gallons per year given 15K a year, would take you like 100 years to break even.

Im not ragging on there tunes, im just saying that that data is misleading at best. HP numbers, ok, torque numbers ok, MPG numbers ok, but trying to tell me that this tune will save me money on DEF is absurd.

2015 Chevy Silverado 2500 HD 6.6L LML
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post #24 of 34 (permalink) Old 10-24-2019, 04:52 PM
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This is all good interaction. I see all the points. I know ppei will be updating this information soon so maybe some more insight then will be provided.

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post #25 of 34 (permalink) Old 10-24-2019, 05:14 PM
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30mpg? Really? Maybe after resetting the dic, coasting downhill with another truck pushing you. My lml on stock fuel and air never saw over 20. Once the big single and fuel went on, maybe 16. This truck turned down to 800hp or so maybe gets 14 Honestly with these trucks anything around 18 is pretty good for their weight and aerodynamics.

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Last edited by SilverGorillaLML; 10-24-2019 at 08:46 PM.
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post #26 of 34 (permalink) Old 10-24-2019, 05:15 PM
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Adam I seeeeeeeee youuuuuu

Race/Pulling truck:2012 CumminGs/Built 6.8L/Big air/Big fuel/48RE Swap/PCS 2000/B&M Gated shifter
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post #27 of 34 (permalink) Old 10-24-2019, 07:57 PM
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Originally Posted by mrmanners View Post
I know ppei will be updating this information soon so maybe some more insight then will be provided.
Throttle response? Dead pedal?

DPF/SCR technology summarized in three words: It doesn't work.
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post #28 of 34 (permalink) Old 10-24-2019, 08:50 PM
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I just love how everyone is caught up on mpg driving a damn 8000lb truck around.



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post #29 of 34 (permalink) Old 10-24-2019, 08:54 PM
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Not me.

DPF/SCR technology summarized in three words: It doesn't work.
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post #30 of 34 (permalink) Old 10-24-2019, 11:22 PM
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30mpg? with these trucks anything around 18 is pretty good for their weight and aerodynamics.
. . . . . .

On those rare occasions when I had to use my truck as a back-up car, yes, I got around 18 - some stop-and-go-, mostly open road.

Most of the time I use the truck for towing - my "toys" (both the box trailer & boat trailer) each about 11,000 lbs. Average on long trips runs about 11 mpg.

That was before a strange animal crawled under my truck and bit off some funny-looking stuff...Ö.

As a side-note, .I like to base my mileage bragging rights by actual miles between fill-ups.

Attending a big car show in Las Vegas over the weekend - that's about 220 miles each way - all Interstate, but some of that ( I-40) involves considerable altitude changes. If anyone's interested in the difference between "bone stock" ( as in crippled by pollution devices that may actually do more harm, overall, to the environment than...well...ÖÖ) and now that some funny looking parts fell off...will report on my return late Sunday.
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2013 3500 long bed crew cab. Purchased at approx. 80,000; now have 91,000, convert to CP3. DPF "triggerd" a limp mode, so was cut out of the vehicle & cleaned by a DPF cleaning co., on re-installation, everything back to normal. Would never ever think of something as nasty and as anti bunny wabbet as a full-delete...after all..dosnt everyone like the fun & excitement of being stuck by the side of a Interstate in the ran while towing when one's truck's computer decides to go into "limp mode"...?.
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