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Hey y’all, I’m a recent member of the forum. I am looking to upgrade my current vehicle and I am doing some informal research. What are the issues you guys are seeing with the 2014-2016 LML engines? Also, what kind of mileage are you seeing in the 3/4 tons with four wheel drive? I’ve been reading a lot of threads on multiple sites but I haven’t seen anything recently on this year range.
 

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Welcome to DieselPlace

You'll find DEF issues, and CP4 grenade issues are commonly reported with the LML.

The best way to combat this CP4 issue is to install a lift pump, buy your fuels only from a well-used source like truckstops, and have quality fuel filtration installed along with a lubricity additive in your fuel with each tank.
Those are things that can reduce your chances of a CP4 issue.
 
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I'm seeing 8-13 mpg towing (depending on what I'm towing) and 16-18 (actual calculations, NOT DIC mileage) in summer and 12-16 in winter (I live in MN) Calculated mileage is always 0.5 mpg to 1.2 mpg lower than what the DIC reports.
 
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