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GDE MPG Info/Study

22K views 75 replies 41 participants last post by  sourdo 
#1 ·
Hey Everyone,

I'm looking for a few users of GDE to provide some basic info and data on their fuel economy results. Ultimately I'm hoping to gather up some real world data to influence my decision on buying the GDE tune and report back to the forum so others can make a more informed decision.

If you are a GDE user I'm looking for the following items.

1. Miles on your truck before GDE tune installed.
2. Miles on your truck since GDE tune installed.
3. Improvement in MPG since GDE tune installed (this can be calculated or educated guess). If calculated, what was your before and after MPG?
4. Yes/No, have you used Fuelly or some other method to track MPG before and after the tune?
5. If yes, how many pre and post GDE fuel ups have you had?

Thanks in advance for everyone's responses. I'll do a deep dive into this and report back my findings ASAP. I know there's a lot of information out there regarding fuel economy related to the GDE tune, but I want to take the opportunity to compile some of this data in one thread.

Kkaldor

Admin/Mods, I know this probably should be in the Tuner forum, but I was thinking it would get more views and responses here. Please move if necessary.
 
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#2 ·
1) <500 miles
2) Approx 53,000
3) Never went through a full tank before tuning
4) YES
5) All Post
 
#3 ·
1. Miles on your truck before GDE tune installed. 25,000

2. Miles on your truck since GDE tune installed. not many, less than 1,000 (installed last week)

3. Improvement in MPG since GDE tune installed (this can be calculated or educated guess). If calculated, what was your before and after MPG?
Mine is still settling in. have had this on truck since last wednesday, so 1 fuel up, which was 75% pre GDE. I did reset the mileage indicator at install, and it is showing 26-27 mpg, still fluctuating. before was 22-24.

4. Yes/No, have you used Fuelly or some other method to track MPG before and after the tune? Fuelly in signature. the note "tune up" is the GDE install. between fuel up 11 and 12.

5. If yes, how many pre and post GDE fuel ups have you had?11 pre, not even 1 full one post......
 
#4 ·
Hey Everyone,

I'm looking for a few users of GDE to provide some basic info and data on their fuel economy results. Ultimately I'm hoping to gather up some real world data to influence my decision on buying the GDE tune and report back to the forum so others can make a more informed decision.

If you are a GDE user I'm looking for the following items.

1. Miles on your truck before GDE tune installed. 50,000
2. Miles on your truck since GDE tune installed. 113,000
3. Improvement in MPG since GDE tune installed (this can be calculated or educated guess). If calculated, what was your before and after MPG? Hand/Fuelly 25.2 B4...27.8 After
4. Yes/No, have you used Fuelly or some other method to track MPG before and after the tune? TES, Fuelly link in my signature...GDE added 9/01/2016
5. If yes, how many pre and post GDE fuel ups have you had? IDK 338 total after today

Thanks in advance for everyone's responses. I'll do a deep dive into this and report back my findings ASAP. I know there's a lot of information out there regarding fuel economy related to the GDE tune, but I want to take the opportunity to compile some of this data in one thread.

Kkaldor

Admin/Mods, I know this probably should be in the Tuner forum, but I was thinking it would get more views and responses here. Please move if necessary.
3//01/2018 I put 305/55/20E AT3Ws on my truck and lost the 2 MPG overall since. After playing w/ tire pressure since I have landed at 63psi cold...down to 1 mpg loss overall and began this pressure 10/01/2018 so time will tell overall MPG. Best tank ever (4x4 leveled) was 725 miles range wise
 
#5 ·
1. 345
2. 1100
3. 4-5
4. no
5. none pre (345 miles) 755 post. Was averaging 30 MPG last 250 miles on 50 MPH secondary roads. Then I had a regen. I'm now @ 28.5 since the regen 50 mi ago but I think it's going to climb back up. Tank's just below 3/4 after 250 miles from fill. I'm lovin' it.


2018 Bighorn 3.55 gears
 
#6 ·
18k before tune, about 98k since...
~2.5MPG gain after tune. Before was about 21.2-21.4, after is about 23.7. (both are inclusive of towing)
Fuelly started tracking a few months before GDE installed.
Roughly 25 pre tune fills, about 200 post tune fills.
 
#22 ·
Sorny,

I ran the numbers going by your Fuelly fills. You averaged 25.15 mpg pre GDE (up to 25th fill), and 23.49 mpg after GDE. Your's actually got worse! Where are you getting your numbers? Not trying to question your numbers, just understand how you feel you've gained 2.5 mpg. Was that based on the EVIC?
 
#7 ·
So what are you afraid of?

Seems to me the question begs the inference that you are thinking of buying and installing GDE into your vehicle. Well on this forum and the GDE forum you will find masses of information discussing not only the mag benefits but the real longevity benefits. Then there's also the performance benefits to be considered.

Since mpg is what you ask about my take after about 75,000 miles of GDE is ... 2 mpg - hand calculated.
 
#9 ·
Not really afraid of anything and yes I am thinking about purchasing. Just would like to see hard MPG data instead of off the cuff guesses (in some cases). I’ve read a lot of people’s opinions and reviews with most being very favorable. Thanks for your response!


Sent from my iPhone using Tapatalk
 
#10 ·
I am also debating the GDE tune for several reasons. One of which is the cost and payback potential. The other is that there are a lot of posts on here talking about how great the tune is when it was put on with less than 1000 miles on the truck. How is there enough butt time to tell a difference? I just rolled past 12,000 miles and don't thing I know the truck well enough to say, "WOW, look what this tune did for me". Heck, the engine is probably not even a quarter of the way to being broken in.

Also, with the latest EPA witch hunts, there is just enough doubt that forces the tune money to go towards the truck payment. At least until the dust settles.
 
#11 ·
1. Miles on your truck before GDE tune installed.
2. Miles on your truck since GDE tune installed.
3. Improvement in MPG since GDE tune installed (this can be calculated or educated guess). If calculated, what was your before and after MPG?
4. Yes/No, have you used Fuelly or some other method to track MPG before and after the tune?
5. If yes, how many pre and post GDE fuel ups have you had?
1-5400 miles
2- 4400 miles (9800 total)
3-Hwy pretuned, 30 mpg, post tuned, 33 mpg. While towing, pretuned was about 13 mpg, post tuned around 14 to 14.5 mpg. Post tuned I get around 25 mpg driving around town. I'm retired, it now takes almost a month to burn through a tank.
4-Pencil and paper and Drivvo android app.
5- Enough to know I get better mileage.
 
#12 ·
I think that the benefit to a tune should not be based solely on better mpg. If you plan on trading in your truck every 2 years then prob not worth messing with. If you plan on running your truck out for the long term then heck yes get one.

Getting rid of smog inefficiency with a tune is guaranteed to get you a bit better mpg. Thats what the tune does plus readjusts the programming to now run as if it is running without smog/egr.

I dont know the additional mpg benefit of the 40hp hot tune I put in my 1500. However I did put the same thing in my wife's stock 2016 GC. We do a 100 mile run to the coast on a windy hilly road frequently. She now gets 33 mpg there and back last time we did it. About 3 mpg increase. So that works out to about a cent a mile she saves on fuel with a 700 dollar tune. So how long for the tune to pay for its self based on fuel savings alone? How many cents are there in 750 dollars?!
 
#13 ·
1. Miles on your truck before GDE tune installed.
2. Miles on your truck since GDE tune installed.
3. Improvement in MPG since GDE tune installed (this can be calculated or educated guess). If calculated, what was your before and after MPG?
4. Yes/No, have you used Fuelly or some other method to track MPG before and after the tune?
5. If yes, how many pre and post GDE fuel ups have you had?
I'm with Cap on this one...it seems you are making this decision on mpg gain alone when the point is that MPG gain is a bonus on top of the other emissions/soot, turbo lag elimination, Etc. But for your purposes, here are my answers:

1. 44K
2. 89K
3. 10% pretty consistently.
4. No
5. N/A
 
#14 ·
Here are my Fuelly stats. Hope they help you.

model mpg odometer miles gallons price city_percentage fuelup_date date_added tags notes
Ram 1500 24.52 36973 220 8.973 2.829 60 9/23/2018 9/23/2018 21:57
Ram 1500 25.68 36753 218 8.489 2.789 60 9/13/2018 9/13/2018 23:59
Ram 1500 21.68 36535 148 6.828 2.789 60 8/26/2018 8/26/2018 21:38
Ram 1500 24.77 36387 109 4.4 2.759 60 8/13/2018 8/13/2018 11:59
Ram 1500 20.83 36278 33 1.584 2.759 60 7/30/2018 7/30/2018 17:13
Ram 1500 29.29 36245 133 4.541 2.759 60 7/23/2018 7/23/2018 11:43
Ram 1500 23.81 36112 175 7.351 2.799 60 7/16/2018 7/16/2018 11:20
Ram 1500 20.45 35937 154 7.529 2.819 60 7/6/2018 7/6/2018 23:07
Ram 1500 27.04 35783 558 20.639 2.749 60 6/21/2018 6/24/2018 13:18
Ram 1500 25.62 35225 108 4.215 2.819 60 6/19/2018 6/19/2018 2:40
Ram 1500 11.23 35117 131 11.67 2.749 60 6/14/2018 6/24/2018 13:16
Ram 1500 23.92 34986 363 15.177 2.999 60 6/4/2018 6/4/2018 11:14
Ram 1500 17.44 34623 132 7.571 2.799 60 4/30/2018 4/30/2018 20:26
Ram 1500 33.34 34491 139 4.169 2.749 60 4/15/2018 4/15/2018 20:49
Ram 1500 26.45 34352 561 21.208 2.699 60 4/9/2018 4/9/2018 12:42
Ram 1500 22.63 33791 220 9.72 2.579 60 4/7/2018 4/7/2018 14:34
Ram 1500 23.2 33571 79 3.405 2.699 60 3/5/2018 3/5/2018 12:48
Ram 1500 26.14 33492 136 5.203 2.749 60 2/25/2018 2/26/2018 16:54
Ram 1500 19.9 33356 67 3.367 2.799 60 2/12/2018 2/12/2018 16:41
Ram 1500 23.07 33289 91 3.944 2.799 50 1/29/2018 1/29/2018 1:47
Ram 1500 26.36 33198 77 2.921 2.699 60 1/25/2018 1/27/2018 18:02
Ram 1500 24.05 33121 549 22.827 2.769 60 1/21/2018 1/27/2018 18:00
Ram 1500 16.77 32572 35 2.087 2.669 60 1/15/2018 1/27/2018 17:59
Ram 1500 26.76 32537 550 20.557 2.669 60 1/11/2018 1/11/2018 23:34
Ram 1500 25.05 31987 72 2.874 2.599 60 1/8/2018 1/8/2018 0:38
Ram 1500 21.19 31915 201 9.487 2.599 60 1/4/2018 1/4/2018 21:36
Ram 1500 26.18 31714 508 19.405 2.999 60 1/1/2018 1/1/2018 19:21
Ram 1500 27.57 31206 650 23.578 2.959 50 12/28/2017 12/28/2017 22:18
Ram 1500 22.71 30556 98 4.316 2.669 60 12/26/2017 12/26/2017 17:43
Ram 1500 24.11 30458 244 10.122 2.479 50 12/17/2017 12/17/2017 21:56
Ram 1500 25.06 30214 356 14.205 2.599 60 12/4/2017 12/4/2017 14:16
Ram 1500 25.1 29858 138 5.498 2.499 60 11/5/2017 11/5/2017 17:10
Ram 1500 25.45 29720 91 3.576 2.499 60 10/23/2017 10/23/2017 11:51
Ram 1500 27.6 29629 573 20.761 2.499 50 10/15/2017 10/15/2017 15:27
Ram 1500 23.14 29056 54 2.334 2.569 60 10/11/2017 10/11/2017 20:16
Ram 1500 26.66 29002 140 5.252 2.499 60 10/6/2017 10/6/2017 12:48
Ram 1500 26.06 28862 150 5.757 2.499 50 9/25/2017 9/25/2017 1:08
Ram 1500 24.61 28712 91 3.698 2.549 60 9/18/2017 9/18/2017 11:30
Ram 1500 27.5 28621 193 7.018 2.599 60 9/8/2017 9/8/2017 14:45
Ram 1500 21.61 28428 65 3.008 2.249 60 8/21/2017 8/21/2017 11:54
Ram 1500 24.49 28363 71 2.899 2.199 60 8/10/2017 8/10/2017 21:55
Ram 1500 28.25 28292 129 4.567 2.179 60 7/31/2017 8/1/2017 16:11
Ram 1500 26.96 28163 615 22.809 1.879 15 7/17/2017 7/17/2017 1:33
Ram 1500 24.96 27548 90 3.606 2.069 50 7/11/2017 7/11/2017 22:37
Ram 1500 26.18 27458 154 5.882 1.999 60 7/7/2017 7/7/2017 14:50
Ram 1500 32.4 27304 199 6.143 2.049 60 6/26/2017 6/26/2017 2:05
Ram 1500 21.8 27105 178 8.165 2.249 60 6/11/2017 6/12/2017 14:50
Ram 1500 25.42 26927 147 5.782 2.199 60 5/31/2017 5/31/2017 13:28
Ram 1500 24.7 26780 140 5.669 2.199 60 5/19/2017 5/20/2017 13:54
Ram 1500 25.98 26640 157 6.043 2.249 60 5/4/2017 5/20/2017 13:58
Ram 1500 37.93 26483 69 1.819 2.249 60 4/20/2017 4/20/2017 20:13
Ram 1500 24.78 26414 192 7.748 2.249 60 4/17/2017 4/17/2017 11:14
Ram 1500 25.5 26222 177 6.942 2.249 60 4/3/2017 4/3/2017 0:34
Ram 1500 21.87 26045 94 4.298 2.299 60 3/19/2017 3/19/2017 20:35
Ram 1500 24.87 25951 137 5.509 2.299 60 3/13/2017 3/13/2017 0:14
Ram 1500 23.95 25814 138 5.763 2.249 50 2/12/2017 2/12/2017 17:53
Ram 1500 23.36 25676 142 6.078 2.249 60 1/30/2017 1/31/2017 22:44
Ram 1500 28.63 25534 578 20.186 2.299 15 1/20/2017 1/20/2017 3:14
Ram 1500 18.42 24956 62 3.366 2.179 50 1/15/2017 1/15/2017 23:33
Ram 1500 25.18 24894 215 8.539 2.149 70 12/29/2016 12/29/2016 20:59
Ram 1500 25.96 24679 570 21.955 2.199 25 12/10/2016 12/10/2016 15:45
Ram 1500 24.63 24109 137 5.562 2.099 60 12/4/2016 12/4/2016 22:02
Ram 1500 26.08 23972 365 13.995 2.079 60 11/27/2016 11/27/2016 23:50
Ram 1500 25.47 23607 259 10.169 2.199 60 11/7/2016 11/7/2016 21:25
Ram 1500 26.81 23348 398 14.844 2.199 40 10/28/2016 10/28/2016 0:23
Ram 1500 23.22 22950 94 4.048 2.099 60 10/14/2016 10/17/2016 12:08
Ram 1500 28.48 22856 546.1 19.178 2.169 15 10/8/2016 10/8/2016 15:45
Ram 1500 26.67 22309.9 281.9 10.569 2.199 60 10/4/2016 10/7/2016 20:06
Ram 1500 24.99 22028 243 9.724 1.999 50 9/18/2016 9/18/2016 22:58
Ram 1500 25.4 21785 257 10.118 2.049 60 9/11/2016 9/11/2016 18:23
Ram 1500 30.47 21528 157 5.152 2.049 60 9/5/2016 9/5/2016 17:29
Ram 1500 20.21 21371 87 4.305 1.999 45 8/28/2016 8/28/2016 16:07
Ram 1500 23.42 21284 195 8.327 1.999 60 8/21/2016 8/21/2016 23:17
Ram 1500 27.81 21089 115 4.136 1.999 45 8/15/2016 8/15/2016 0:20 "GDE
Def. 4.549 gal $12.14"
Ram 1500 24.04 20974 198 8.238 1.999 60 8/8/2016 8/8/2016 2:19
Ram 1500 23.9 20776 301 12.596 1.999 60 7/29/2016 7/29/2016 2:20 No GDE
Ram 1500 28.3 20475 282 9.964 2.099 60 7/11/2016 7/11/2016 2:02
Ram 1500 27.29 20193 580 21.257 2.169 20 7/2/2016 7/2/2016 15:52
Ram 1500 25.77 19613 106 4.113 2.169 85 6/26/2016 6/27/2016 16:57
Ram 1500 27.79 19507 192 6.908 2.069 60 6/25/2016 6/27/2016 16:55
Ram 1500 26.06 19315 216 8.289 1.999 60 6/19/2016 6/19/2016 23:38
Ram 1500 24.56 19099 298 12.132 2.209 60 6/4/2016 6/4/2016 14:40
Ram 1500 26.56 18801 234 8.811 2.029 60 5/17/2016 5/17/2016 1:08
Ram 1500 29.62 18567 381 12.865 1.969 60 5/12/2016 5/12/2016 1:09
Ram 1500 21.99 18186 142 6.459 1.909 60 5/6/2016 5/6/2016 21:19
Ram 1500 25 18044 160 6.4 1.849 60 4/25/2016 4/25/2016 3:32
Ram 1500 27.52 17884 182 6.613 1.739 60 4/20/2016 4/20/2016 1:27
Ram 1500 26.48 17702 223 8.423 1.809 50 4/5/2016 4/5/2016 2:48
Ram 1500 27.08 17479 534 19.721 1.759 30 3/21/2016 3/21/2016 0:07
Ram 1500 23.29 16945 206 8.845 1.779 50 3/7/2016 3/7/2016 2:52
Ram 1500 30.32 16739 254 8.378 1.689 60 2/28/2016 2/28/2016 23:41
Ram 1500 21.3 16485 247 11.599 1.619 60 2/14/2016 2/14/2016 15:17
Ram 1500 25.17 16238 546 21.694 1.699 25 1/29/2016 1/29/2016 2:02
Ram 1500 17.07 15692 93 5.449 1.789 60 1/24/2016 1/29/2016 13:56
Ram 1500 24.62 15599 261 10.6 1.819 50 1/15/2016 1/15/2016 1:09
Ram 1500 26.4 15338 541 20.49 1.859 15 1/8/2016 1/8/2016 1:13
Ram 1500 26.2 14797 176 6.717 1.859 60 1/3/2016 1/3/2016 22:33
Ram 1500 26.63 14621 390 14.647 1.859 60 12/31/2015 12/31/2015 20:21
Ram 1500 26.67 14231 253 9.487 1.859 60 12/23/2015 12/23/2015 20:56
Ram 1500 28.5 13978 419 14.703 1.949 50 12/20/2015 12/20/2015 13:35
Ram 1500 26.46 13559 225 8.503 1.899 60 12/14/2015 12/14/2015 1:37
Ram 1500 30.55 13334 431 14.11 1.949 50 12/10/2015 12/10/2015 19:42
Ram 1500 23.59 12903 467 19.797 1.979 50 12/4/2015 12/4/2015 22:22 Start of GDE
Ram 1500 22.79 12436 228 10.006 1.999 60 11/16/2015 11/16/2015 13:31
Ram 1500 26.53 12208 300 11.31 1.999 60 11/1/2015 11/1/2015 21:13
Ram 1500 18.23 11908 100 5.487 1.999 60 10/25/2015 10/25/2015 14:45
Ram 1500 26.02 11808 506 19.445 1.999 60 10/22/2015 10/22/2015 19:15
Ram 1500 26.48 11302 594 22.433 2.069 15 10/3/2015 10/3/2015 16:41
Ram 1500 22.63 10708 187 8.263 2.007 60 9/28/2015 10/3/2015 17:52
Ram 1500 23.62 10521 534 22.613 2.069 60 9/19/2015 9/20/2015 1:29
Ram 1500 28.37 9987 413 14.56 2.129 25 8/21/2015 8/21/2015 15:30
Ram 1500 27.92 9574 150 5.373 2.199 60 8/16/2015 8/16/2015 11:56
Ram 1500 18.88 9424 99 5.244 2.159 60 8/13/2015 8/14/2015 11:14
Ram 1500 23.43 9325 363 15.495 2.229 65 8/6/2015 8/6/2015 18:43
Ram 1500 25.68 8962 351 13.666 2.329 60 7/16/2015 7/16/2015 16:55
Ram 1500 26.35 8611 478 18.139 2.359 60 7/9/2015 7/9/2015 21:18
Ram 1500 25.31 8133 389 15.367 2.499 60 6/30/2015 7/1/2015 15:42
Ram 1500 21.13 7744 165 7.809 2.429 60 6/12/2015 6/12/2015 11:25
Ram 1500 20.21 7579 117 5.79 2.548 50 5/31/2015 5/31/2015 23:58
Ram 1500 28.23 7462 223 7.899 2.699 60 5/20/2015 5/20/2015 19:40
Ram 1500 24.77 7239 164 6.62 2.569 60 5/17/2015 5/17/2015 12:02
Ram 1500 23.52 7075 287 12.205 2.429 60 5/10/2015 5/11/2015 20:02
Ram 1500 23.79 6788 186 7.818 2.499 60 4/30/2015 5/11/2015 20:09
Ram 1500 23.21 6602 159 6.85 2.449 60 4/23/2015 5/11/2015 20:07
Ram 1500 22.47 6443 236 10.505 2.469 60 4/16/2015 4/16/2015 17:32
Ram 1500 28.41 6207 260 9.152 2.559 60 3/26/2015 3/26/2015 16:15
Ram 1500 28.62 5947 203 7.093 2.559 60 3/19/2015 3/19/2015 18:01
Ram 1500 21.62 5744 213 9.852 2.579 50 3/12/2015 3/12/2015 18:34
Ram 1500 18.43 5531 367 19.918 2.669 50 3/3/2015 3/3/2015 14:53
Ram 1500 22.74 5164 99 4.353 2.459 50 1/29/2015 1/30/2015 12:39
Ram 1500 23.05 5065 217 9.415 2.429 60 1/13/2015 1/13/2015 17:27
Ram 1500 25.01 4848 417 16.672 2.999 50 1/4/2015 1/4/2015 22:53
Ram 1500 22.42 4431 267 11.908 2.859 60 12/31/2014 12/31/2014 18:51
Ram 1500 19.06 4164 159 8.341 3.079 60 12/9/2014 12/9/2014 20:19
Ram 1500 25.45 4005 372 14.618 3.299 50 11/29/2014 11/29/2014 16:37
Ram 1500 22.64 3633 498 22 3.359 40 11/15/2014 11/15/2014 15:23
Ram 1500 24.45 3135 454 18.57 3.299 50 11/4/2014 11/4/2014 17:51
Ram 1500 27.02 2681 500 18.502 3.339 30 10/16/2014 10/16/2014 23:02
Ram 1500 22.2 2181 184 8.29 3.459 50 10/11/2014 10/11/2014 13:17
Ram 1500 25.25 1997 361 14.299 3.419 50 10/1/2014 10/1/2014 2:11
Ram 1500 24.62 1636 505 20.513 3.539 70 9/15/2014 9/15/2014 0:05
Ram 1500 24.98 1131 343 13.733 3.53 60 8/27/2014 8/27/2014 21:33
Ram 1500 24.5 788 492 20.084 3.519 65 8/16/2014 8/16/2014 15:29
Ram 1500 0 296 0 12.42 3.479 50 7/29/2014 7/30/2014 2:12 1/3 empty Mixed city and highway. Brand new truck, tank was 1/3 empty, filled up to take advantage of Mapco Rewards discount.
 
#15 ·
No need to run elaborate spread sheets. The info on the GDE site and this forum is indeed accurate. Provided you are doing your part, MPG will increase 2-3 MPG. Most non-SRA tires will decrease your MPG. I dont recall anyone posting that their MPG increased by using non-SRA tires.
 
#17 ·
I know I could take everyone’s word for it, but I’m an engineer and I like data. Case in point if I just looked at what sourdo is getting, I would think I should be getting 30mpg all day long. Well I can baby the crap out of my truck and never have a prayer to get that high. I just don’t know how it’s possible. Maybe he got “one of the good ones”. I’m running 23-24 mpg occasionally higher or lower. I know it all depends on driving habits, I’d love to know those of the people getting upwards of 30 mpg.

I do realize there are many other benefits to GDE tunes and they are very valuable as well.


Sent from my iPhone using Tapatalk
 
#16 ·
Few things to add to the equation.
1) Time cleaning things like MAP sensors
2) Down time due to soot build up causing a repair issue
3) Less engine wear due to less abrasive soot in the oil
4) Longer DPF life due to less REGEN cycles
 
#18 ·
I held off on buying GDE based on the long pay off from MPG improvement. I did see the expected 2-3 mpg improvement but looking back I should have bought GDE when it was released. Now, I would buy it for the EGR delete alone, or for the improved throttle response alone, or for the reduced regen frequency. The additional MPG is a nice benefit. One of the things that’s hard to articulate is how the emissions systems on these trucks impacts fuel economy. With stock tune, the DPF clogs up quickly and mpg’s drop during regen (or as DPF becomes clogged) this is amplified with lots of short trips. With GDE you’ll regen much less frequently and I don’t notice the swings in fuel economy short trips vs long. Towing with vs without GDE the benefit in economy is less noticeable. Basically, if your primary use is long trips towing I don’t think GDE will give as significant mpg gain but it will provide a little additional power and much cleaner oil. If you need data to justify the decision and the performance and EGR delete are of no interest to you, GDE might not be for you. For me, waiting to tune is the only regret I have with this truck.
I tuned at 50k and now have close to 70k.
 
#20 ·
Like others have said you can’t just look at MPG savings and the only way to quantify the purchase. Yes it will take awhile to break even dollar wise. But as others have said this will help with the longevity of your engine. Turning off the EGR is the best long term move. Also you won’t have has many dumb check engine lights or service electronic throttle control issues. To me personally that’s the best of them all. I’ll glady spend the extra 800 bucks to save my self even one extra hour at the dealership. Your time is worth more than that.
 
#21 ·
Yes, and as others have stated, I mostly liked the reduced off idle lag (was really annoying and somewhat dangerous IMO with the stock tune), the "perkier" acceleration, and just overall more fun to drive characteristics. Lack of cel and egr issues is a great benefit. I opted for the engine break and regen notices and although have not yet towed, the engine brake going down Mont Eagle mountain near Chattanooga is great, set cruise at 60 or 65 and when engine downshifts attempting to maintain speed, the engine brake kicks in and holds the speed exactly where the cruise setting is. I presume it will do the same when towing, saving brakes.
 
#25 ·
I posted fuel calcs last week showing almost 12% improvement.

There is so much data already posted, this is just a waste of time. Buy it, don’t buy it. Your loss.
 
#26 ·
Thanks for the reply Domino, I’ll have to try find your post.

Yeah, there is a lot of data on this. A lot that hasn’t been proven or truly analyzed (some has been). A lot of guys saying “I got 10%” or “I gained 3 mpg”. That’s not data. Those are statements. It’s not a waste of time. I’m sure there are plenty of prospective buyers out there like me who would like to see actual data in one place, not strewn about across the internet. That’s what I’m trying to do.

I’ve already disproven one persons claims of a gain with real data. That is not my goal, but that is also why you can’t believe everything you read.

Apparently some are too hung up on pointing out that there are other benefits to the tune, which I totally agree with, but that’s not helping the cause here.

Thanks to those who have posted some data that I can truly analyze!


Sent from my iPhone using Tapatalk
 
#27 ·
This was a no brainer for me. After spending many hours reading, gathering data, gathering information, etc. Makes sence, the egr is an enemy of our ED. I drove a 2004 with the mighty 5.9 with no egr , just a straight pipe. It had over 400k miles and still ran perfectly. I wasn't so concerned about mileage as I was turning the egr off. Anyway I have a '18 ED and installed the GDE at 600 miles. It now has around 3400. I tow a little 5 x 8 trailer everyday and average 24.8 mpg. City and hwy combined. I will be installing the GDE tranny tune real soon.
 
#31 ·
Well I’ve really only received enough data to analyze two different trucks. I’ve posted those results, but Sorny’s was not fully inclusive data so that one was scewed. Without actual Fuelly or equivalent data I cannot properly calculate the results. I was hoping for more complete data.


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#32 ·
I analyze my own data as that is what I do for a living... You can see the red arrow is before and to the right is after. Also, large dip in winter months is due to towing snowmobile trailers at higher rates of speed to get up north to the good snow!!!

View attachment 75772 Text Sky Mountain Slope Font


Apologies, I did not snip the image with median MPG,so I updated a 2nd image.
 
#33 ·
Having been here a few years, I've seen that the large majority of GDE owners have realized the mileage gains advertised by GDE. That in itself will pay for the tune over time.

I didn't tune for MPG. I tuned to keep the inside of the engine as clean as possible for longevity. I can pull the dipstick at 5k and the oil is still clean, not ink black like the stock tune at 100mi.

I tuned because the stock tune is finicky and erroneous trouble codes will have you back at the dealer often. I tuned because more power will help me tow, which is important to me.

I tuned the trans because it wakes up this lazy trans and makes the truck downright fun to drive.

Best of luck in your numbers quest. I tuned at 457mi so I really have no baseline with the stock tune.
 
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#36 ·
Even across, no bowing in the middle. 65psi max cold on these. New were 18/32 depth...30,000 miles and 15/32 depth all four. Was also 15/32 after rotation at 22k so I honestly don't get how 0 wear last 8k.

Started at 54psi when new...worse MPG with lower psi and ride no difference at higher regarding bumps. Put Helwig 7709 on couple of weeks ago and ride better now than when new...of all my mods..the rear bar has been by far the best regarding overall drive-ability.
 
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