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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 05-22-2019, 11:01 AM   #71 (permalink)
moseso
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Join Date: Sep 2010
Location: Burlington Ontario
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Just got back from our semi-annual trip to Florida. 2018 GMC 3500 Duramax SRW with 16,000 miles on it. Left for Orlando from Burlington, Ontario Canada. Drove 1305 miles without towing; averaged 70 mph; got 20.8 mpg.
Towed 16,000 lb 44ft 5th wheel back home, total towing 1,250 miles (stopped in Niagara Falls Ontario); got 10.5 mpg towing.
I am really pleased with the 2018. The additional horse power and torque was really noticeable compared to my 2011 2500 HD Duramax. It did not gear down on most uphill climbs as the 2011 did. The best mileage I got on the 2011 was 11.1 mpg towing 14,000 40 ft 5th wheel, low was 9.9 mpg with headwind.

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2018 3500 Duri HD Crew, SRW
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Old 05-24-2019, 11:02 PM   #72 (permalink)
cowdoc
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Join Date: Nov 2004
Location: Alabama
Posts: 1,257
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New best of 20.5

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2018 CC SWB Sierra SLE 2500HD Z71
Banks Deringer and CAI

CP4 failure: 2015 GMC Denali SRW 3500HD 4x4
ppei; 5" straight pipe
Sold: '15 Silverado LTZ CC SB Z-71 4x4,
ll stock
Sold: '11 Silverado LTZ CC SB Z-71 4x4,
MiniMaxx w/ delete package
Sold: '07 Silverado LT2 CC SB 4x4 LBZ/Ally, 206k
KD Performance/Tow Tune, 4" MBRP downpipe-back, Line-X
Sold: '05 GMC SLE CC SB 4x4 LLY/Ally, 45k, Predator
Sold: '02 Silverado LS EC 4x4 LB7/Ally
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Old 06-30-2019, 03:20 PM   #73 (permalink)
duramaxed12
Low Boost
 
Join Date: Aug 2008
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Wow you guys are getting awesome mileage.
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Old 07-31-2019, 08:44 PM   #74 (permalink)
cowdoc
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Location: Alabama
Posts: 1,257
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Update:
Best of 21.5 so far. Averaged 20.06 for June and 20.68 for July. Not too bad!
__________________
2018 CC SWB Sierra SLE 2500HD Z71
Banks Deringer and CAI

CP4 failure: 2015 GMC Denali SRW 3500HD 4x4
ppei; 5" straight pipe
Sold: '15 Silverado LTZ CC SB Z-71 4x4,
ll stock
Sold: '11 Silverado LTZ CC SB Z-71 4x4,
MiniMaxx w/ delete package
Sold: '07 Silverado LT2 CC SB 4x4 LBZ/Ally, 206k
KD Performance/Tow Tune, 4" MBRP downpipe-back, Line-X
Sold: '05 GMC SLE CC SB 4x4 LLY/Ally, 45k, Predator
Sold: '02 Silverado LS EC 4x4 LB7/Ally
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Old 08-01-2019, 09:57 AM   #75 (permalink)
plumber19832003
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Join Date: Jul 2019
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mileage

with 4400 mi , with my driving habits i am getting 17-18 mpg. around 450-500 miles per tank.
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Old 08-01-2019, 05:01 PM   #76 (permalink)
cowdoc
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Join Date: Nov 2004
Location: Alabama
Posts: 1,257
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Almost 65k on the truck and a lifetime average of 18.8 mpg. I have gone over 700 miles on a tank a couple of times. I get around 14 mpg pulling my 3-horse slant aluminum horse trailer with small living quarters.
__________________
2018 CC SWB Sierra SLE 2500HD Z71
Banks Deringer and CAI

CP4 failure: 2015 GMC Denali SRW 3500HD 4x4
ppei; 5" straight pipe
Sold: '15 Silverado LTZ CC SB Z-71 4x4,
ll stock
Sold: '11 Silverado LTZ CC SB Z-71 4x4,
MiniMaxx w/ delete package
Sold: '07 Silverado LT2 CC SB 4x4 LBZ/Ally, 206k
KD Performance/Tow Tune, 4" MBRP downpipe-back, Line-X
Sold: '05 GMC SLE CC SB 4x4 LLY/Ally, 45k, Predator
Sold: '02 Silverado LS EC 4x4 LB7/Ally
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Old 08-02-2019, 06:19 AM   #77 (permalink)
Wagontrail
Self Ignition
 
Join Date: Feb 2011
Posts: 89
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Did a 3000 loop, illinois to co, wy,into sd. Big grades, got 11.7, that was calculated by hand, waiting for the 21's . There is noise within gm of big things on horizon. Good friend of mine is in the upper eschalon at gmc, I'll let all know what uncle chuck can find out,,, see ya WT
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Old 08-04-2019, 05:05 PM   #78 (permalink)
wensteph
Heat Sink
 
Join Date: Nov 2010
Location: Savannah, GA
Posts: 12
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Savannah to Balsam, NC. 700 miles RT. Lots of IH95 and IH26 at 80 and stretches at 90 (when IH95 is running fast, it runs fast). Mountains (hills) on IH26 South of Asheville. Overall DIC was 18.3. For an aerodynamic brick at those speeds, I think that's pretty impressive.
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