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Duramax Sixth Generation: 2017+ (L5P) Discuss the sixth generation (2017+) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 07-09-2017, 10:20 PM   #11 (permalink)
Nosmokelml
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Cruise at 71. 4x4 cc Denali

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Old 03-14-2018, 11:34 AM   #12 (permalink)
Ramler
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Just turned over 15,000. Phone app says 18.5 lifetime. Normally 20-22 on long trips running empty. 11-13 towing my 7,000 lb. trailer.

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Old 03-15-2018, 01:26 PM   #13 (permalink)
Jeepmanmatt
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Highway mpg between 18-20 unloaded depending on the terrain and speed.
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Old 03-31-2018, 09:11 AM   #14 (permalink)
joechet
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5,900 miles on truck, Lifetime avg is 15.5. Just returned home from a 3,400 mile trip from cooler temps to the Gulf in MS. 90% interstate driving, trailering a Uhaul auto transport with a car on it and very little weight in truck, cruise set at 73 most of the time. Avg 14.9 mpg / Avg 1 gal DEF each 680 miles, 75psi all tires, (unloaded daily driver use 65 fr / 50 rear). Better fuel mileage in the warmer weather. Truck has plenty of power and rides smooth. Very satisfied so far!
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Old 08-14-2018, 01:42 PM   #15 (permalink)
BeastGMC
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I drove mine from Dallas Texas to Raleigh NC through the mountains and ended the trip 18.8 MPG. Way better than the tahoe I sold to buy this truck!!
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Old 08-22-2018, 03:08 PM   #16 (permalink)
1thackattack
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I was averaging 24.7 at 75 on I-15 the other day


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Old 08-22-2018, 05:29 PM   #17 (permalink)
BanksLB7Duramax
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Quote:
Originally Posted by 1thackattack View Post
I was averaging 24.7 at 75 on I-15 the other day
For how many seconds?
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Wishing it sounded like my old LB7 with Banks exhaust. . . . . . .
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Old 08-22-2018, 05:35 PM   #18 (permalink)
1thackattack
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Quote:
Originally Posted by BanksLB7Duramax View Post
For how many seconds?


Lol, not seconds, it lasted for quite a while once i had been driving on the freeway for a little
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Old 08-22-2018, 07:26 PM   #19 (permalink)
oldschoolbowtie
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Quote:
Originally Posted by 1thackattack View Post
Lol, not seconds, it lasted for quite a while once i had been driving on the freeway for a little
impressive
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2007.5 3500HD Silverado LTZ
Kennedy Custom Tune Banks Intake and 4 " exhaust, Air Dog 150, Leveled front end, aftermarket upper control arms, tie rod end sleeves, bypass oil filter, Pusher 3" "hot side" charger tube, aFe Turbo inlet pipe, PPE deep Trans Pan with temp gage, 2 low mod for front differential disable, PACBRAKE 5000# Air Bags with remote on board air...otherwise stock


1953 Chevy truck 496 2 NOS kits ...otherwise stock


1927 Roadster 383 2 NOS kits chassis car (street legal)// otherwise stock
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Old 08-22-2018, 08:02 PM   #20 (permalink)
CntrlCalDmax
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Quote:
Originally Posted by 1thackattack View Post
I was averaging 24.7 at 75 on I-15 the other day

Sounds just like my Dodge friends!

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2007 Mobile Suites 36' TK3 Demco Glide Ride Pin, weighs 17,500# loaded.

2007 GMC LBZ/ALY 4X4 SLT CC 3500 DRW - TransferFlow Tank Tool Box Combo, EFILive DSP5, MBRP, Fred's 1.5 spacers, BD Exhaust Brake.
2004 GMC LLY/ALY 4X4 SLT CC SB, EFIlive, Mike L SCIV, TRADED
2001 Chevy LB7/ALY 4X4 EC SB - SOLD to neighbor
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