2017 L5P Fuel Mileage ??? - Chevy and GMC Duramax Diesel Forum
2017+ L5P Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 118 (permalink) Old 01-19-2017, 08:56 PM Thread Starter
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2017 L5P Fuel Mileage ???

What is everyone seeing for fuel mileage on the new LP5? My buddy has one and has been complaining that the best he is seeing is 17mpg on the highway.

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post #2 of 118 (permalink) Old 01-21-2017, 03:47 PM
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What is everyone seeing for fuel mileage on the new LP5? My buddy has one and has been complaining that the best he is seeing is 17mpg on the highway.
dri

Drove 450 miles yesterday (all interstate highway) and saw 15.9 on The DIC. couple of things to note...I put on 275/65X20 tires and was running between 70-90mph. So not to crazy. I have not reprogrammed the electronics in the truck for the new size tires but will do when my mechanic gets the software update for this.
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post #3 of 118 (permalink) Old 01-21-2017, 06:30 PM
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My average is about 18 with a best of 19.1 so far.
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post #4 of 118 (permalink) Old 01-21-2017, 08:35 PM
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What is everyone seeing for fuel mileage on the new LP5? My buddy has one and has been complaining that the best he is seeing is 17mpg on the highway.
How fast does he run?

2011 GMC 2500 LML CCSB 4x4 SLT
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post #5 of 118 (permalink) Old 01-21-2017, 09:16 PM
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Did 17.8 MPG doing 75-80 mph on a 350 mile trip into the moutains and back...Trucks first trip.
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post #6 of 118 (permalink) Old 01-22-2017, 04:50 AM Thread Starter
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How fast does he run?
He runs 75 to 80mph on Highway.

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-2" Rear Drop Shackle & 1" Front Level
-295/55/20 Nitto Ridge Grappler's
-20 x 10 Fuel Coupler Wheels
-6" OEM Round side steps coated in Black Line X
-Blacked out Badges
-Rear Upper Spoiler & Smoked LED 3rd Brake Light
-FULL Chrome Delete
-20% Tint, Window Guards & Clear Bra
-BakFlip Bed Cover
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post #7 of 118 (permalink) Old 01-22-2017, 06:48 PM
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Around 17 at 80-82.

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post #8 of 118 (permalink) Old 01-22-2017, 08:28 PM
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I've seen a best of over 20 and average of 17-18mpg so far. Average while towing was 15-16 from DIC. None of this is hand calculated though.

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post #9 of 118 (permalink) Old 01-22-2017, 08:41 PM
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Just drove 405 mile trip today, got 14.1 mpg. Was driving 80 - 85 most of the time.
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post #10 of 118 (permalink) Old 01-23-2017, 04:15 AM
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This was just before the turbo failed, I was pretty happy with the fuel economy on my L5P
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