Forum Discussion
Me_Again
Apr 02, 2020Explorer III
Cummins12V98 wrote:steve-n-vicki wrote:
Set the cruise control at 72 all the way home for 50 miles and be indicated MPG was 14.2
Congrats! Sounds like a great truck, 8' bed GOOD for you.
My opinion, I would have been varying speed with a new engine.
Cummins claims the engine needs no break in. The AAM rear diff is what they want 500 miles of slower service out of the box. When we bought our 2015 in Greeley, Co we went up 287 to Laramie at slow speeds and jumped on I-80 and slow built speed to 80MPH and drove for hours at that speed, and again the next morning in Eastern Utah. You saw the diff gears at first fluid change that you helped me with.

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