I purchased this truck new on Dec 31 2018. As of November 11h 2021, the truck has a little over 17000 miles on it. The majority of the miles come from long road trips.

 

 

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So you want to know what the fuel mileage is on the L5P Duramax? Here's a video of my truck with the cruise control on at 55, 60, 65, 70 and 75 mph on flat ground not towing anything. The truck only had 450 miles on it. Below is another video of the INSTANT MPG's while the truck is doing an Exhaust Regeneration.

 

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Below is another video of the INSTANT MPG's while the truck is doing an Exhaust Regeneration. The truck only had 1000 miles on it.

 

 

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Here is the BEST Fuel Mileage on a 2500 Mile open road trip.