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Duramax Fourth Generation: 2007.5-2010 (LMM) Discuss the fourth generation (2007.5-2010) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 02-24-2017, 02:49 PM   #1 (permalink)
Texas_Diesel
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Poor fuel mileage with EFILive... Whats the deal???

I have a 2010 LMM crewcab with all of the deletes, lift pump, etc and EFILive from Idaho Rob at ATPTrucks. Truck is lifted 7" on 355/40/22 trail grapplers and has 92k miles on it. I have 5 tunes with the DSP5 switch. I typically leave it on my #3 tune which is my fuel economy tune and I do not have a heavy foot.

I've been averaging 13 mpg for awhile now and I don't understand why its so low. I can squeeze a little more on a hwy trip if I really baby it but not much. My buddies here at work have LML's (2011 and 2012) that are both tuned by Kory Willis at PPEI and both lifted like i am on 35's and they're getting much better fuel mileage I am. They say they both average 16-17 mpg and can get 20+ mpg on the hwy.

How is that possible with our trucks being setup so similar? Do the LML's just naturally get better mileage.

I like my tunes from Rob but id like to get better fuel mileage out of the truck. I was thinking about giving Kory's tunes a try to see if I can get mine up in the 16-17 mpg area or better.

LMK if anyone else has noticed this same thing??

Thanks fellas!!

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Old 02-24-2017, 05:11 PM   #2 (permalink)
Rvn4me
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If you were getting 16/17 mpg befor Idaho Rob's tune and nothing else changed now getting 13 mpg I'd be calling him up real quick.

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Old 02-24-2017, 06:17 PM   #3 (permalink)
Texas_Diesel
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Well the truck was already lifted before I deleted and tuned it. Before tuning, I remember it being around 12.5-13 on the DIC. Now it stays at 13mpg on average so I might have picked up .5 mpg if that. Negligible change. I would have expected to see more from what I've heard people on the forums claiming they get with similar setups. I always chalked it up to the lift, wheels and tires but talking to my buddies the other day and hearing what they're getting made me think a little. The only difference I can see between our trucks is tuning.
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2010 Chevy Silverado CCSB 2500HD LMM Duramax LTZ
7" Mcgaughys lift w/Fox 2.0's, Amp Research steps, 22x14 Moto metal 962's, 355/40/22 Nitto Trail Graps, Kryptonite front end upgrades, Fully deleted w/ Magnaflow 3" DP, FloPro 5" straight pipe, S&B CAI, EGR delete, PCV reroute, EFILIVE from ATP with DSP5 switch, Edge insight CTS2 w/ EGT probe, FASS 150, 6000k HID'S in headlights/fogs, factory cleared headlights, Recon tails, Limo tint, etc.
2012 C6 ZR1
2008 Blown C6 Z06
2008 Big Dog Pitbull
2007 GSXR 1000
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Old 02-24-2017, 07:52 PM   #4 (permalink)
rmoore0852
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The DIC readout is worthless. Electronics can make it read whatever they want. Before EFI I used a canned Superchips tuner. It would read 21-22 mpg on the DIC. Hand calculated was about 17 mpg, now with EFI 18-20 mpg. I'm not lifted and run 265 BFGs. Also remember, if not corrected, the tire size throws off the odometer, which therefore throws off the mileage calculations.


With your lift and tires, I would expect around 15 mpg or less. Quickest way to kill mileage is big lifts and big offroad tires. If your buddies are reading their mpg off their DIC, then you are comparing worthless numbers. If your odometer does not accurately read distance you are comparing worthless numbers.
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2006 2500HD LBZ CCSB 4x4 178k miles, EFILive by ATP, 265/75/16 BFGs, Nicktane adapter w/2 micron CAT filter, Bilstein 5100's, Diamond Eye cat delete, MBRP downpipe, MBRP 4" exhaust with muffler, LML exhaust manifold and heat shield, EDGE Insight CTS, RedHead Steering gearbox, Demco Autoslide 18k hitch, ARP head studs and rod bolts, Transgo Jr with Transynd, MA pump rub kit and transfer case back half, MA transfer case brace, Kennedy single lift pump

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Old 02-24-2017, 08:06 PM   #5 (permalink)
Ramblinrodney
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Most tuners don't claim any mileage gain. What mileage were your friends LML's getting befor there Kory Willis tune? I dought they improved very little if any. You look at all stock mileage threads. I get 13 mpg summer, bought new, no lift and 265 tires. Others claim 20+ and everything in between. Same year some setup. My thoughts on this. "It is what it is"
Picking up .5 and more power I consider that a winner.ju
Way back people with LB7's claimed 29 mpg.
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Last edited by Ramblinrodney; 02-24-2017 at 08:19 PM.
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Old 02-24-2017, 08:40 PM   #6 (permalink)
IGO1320
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I call "BS"! LOL.
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2006 2500HD CCSB 4X4 RED LBZ
Spray-In Bed Liner, Air Bags
Custom Reese 20K slider FWH/Gooseneck hitch
265/75/16 Michelin LTX AT2's on PYO's
Duramax.com tow tune w/turbo brake
PPE Dual Fueler (P0087 cure)
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Amsoil in all places, Amsoil BMK-27 Bypass
KYB shocks (stock sucked)
Autometer Boost/Pyro gauges/Edge CTS
EGR blocker and (Kennedy) finger stick
Merchant remanufactured transfer case 748,000
Kennedy lift pump, reserve tank with transfer pump
Suncoast trans and 1700 stall converter @ 748,000
14.558 @ 91.03 Hypertech now?????

Last edited by IGO1320; 02-24-2017 at 08:41 PM.
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Old 02-24-2017, 08:57 PM   #7 (permalink)
Ramblinrodney
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Here's what some others are getting with 06/07 LBZ's
"I get 26mpg doing an average of 75miles an hour and about 22 pulling my 32ft 12000 pound fifth wheel"
"My truck i've always gotten 26 mpg"
" I got 24 driving home (hand calculated)
"I get 20 around town and 23-25 on the freeway. i have 33" tires cold air intake 4" exhaust and the banks big head for

My thought"It is what it is"

I like this persons thought on this matter.
"He who has the biggest lie wins! I'd like to report that my truck gets 99 MPG! Now who can top that!
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07 Chevy Classic 2500HD 4x4 2LT LBZ CC/SB White
Nasta Nerf Bars, Line-x, Rancho RS9000XL Shocks, Firestone air bags, Fold-a-cover,
Good/Year Wrangler S/A 265/75/16 E
Transgo Jr. PCV Reroute kit, Trans Line Repair Kit By Dirty Hooker Diesel,
Custom Perf/Tow Tune by Kennedy
2019 Arctic Fox 27-5L 10,500 dry weight
UAW Local 699 Retired Test Technician

Last edited by Ramblinrodney; 02-24-2017 at 09:02 PM.
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Old 02-24-2017, 09:45 PM   #8 (permalink)
LBZjunkie
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Not an LMM but with our LBZ with OE tire size I had to recalibrate the tire size a couple times to get the computer to finally display the correct speed/miles driven. Between a MPH app and multiple runs checking actual miles driven vs displayed I have it almost spot on. We average 12 - 12.5MPG towing our 5er. My wife around town is around 14ish, me on the highway, lately is 20.5ish, the DIC reads 16.7 average, my fuelly app is actually 14.7 as of our last fill up. Without knowing if your miles displayed is an actual miles driven your SOL, that much lift, that wide of a tire I wouldn't expect much better than what you are seeing, sorry but you wanna play, you gotta pay, for fuel that is.
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EGR delete
Junk *** POS Duramileage tuner-WTF WAS I THINKING!
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Old 02-24-2017, 10:41 PM   #9 (permalink)
TheBac
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Why arent you asking ATP about it?
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Old 02-25-2017, 01:15 AM   #10 (permalink)
Texas_Diesel
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I took into consideration that the DIC was inaccurate. I've calculated by hand but if my speedo isn't calibrated, I guess that could be off as well. I don't mind paying to play. I just figured I'd see if I was getting lower than the usual mpg for a setup like mine.

I'm not 100% sure what they were getting for mileage before tuning. I'll have to ask. I do agree that any gain in mpg is positive considering the power I got out of the tuning. Def worth it regardless.

I've been told the LBZ's were a little better when it comes to fuel mileage. I figured the LMM and LML would be fairly similar though. 20+ would be awesome but I just don't see it happening. Lol

I'll have to recalibrate my speedo and see if I can confirm its accuracy.

I've spoken with ATP several times but not regarding this. They've been great with their customer service and I'm happy with Rob's tuning. Maybe I'll give them a shout again and just ask what's normal for fuel mileage on a setup like mine. I might be right on par with the rest. I just figured maybe Kory's tunes might somehow get better fuel mileage after discussing it with my buddies. I might give Kory's tunes a try when I have the extra cash to burn on fixing something that isn't necessarily broken. Lol

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2010 Chevy Silverado CCSB 2500HD LMM Duramax LTZ
7" Mcgaughys lift w/Fox 2.0's, Amp Research steps, 22x14 Moto metal 962's, 355/40/22 Nitto Trail Graps, Kryptonite front end upgrades, Fully deleted w/ Magnaflow 3" DP, FloPro 5" straight pipe, S&B CAI, EGR delete, PCV reroute, EFILIVE from ATP with DSP5 switch, Edge insight CTS2 w/ EGT probe, FASS 150, 6000k HID'S in headlights/fogs, factory cleared headlights, Recon tails, Limo tint, etc.
2012 C6 ZR1
2008 Blown C6 Z06
2008 Big Dog Pitbull
2007 GSXR 1000
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