The air dam might also be to keep too much air from building up under the truck at speed and flipping the truck end for end like NASCAR. If upending is felt by the stabilitrac the moonroof automatically opens to lessen the possibility of cartwheeling.

 

^ This.

That scrappy, delicate little piece of plastic is worth 0.6% mpg on some light duties. Source: 2013-2016 Dodge Ram 1500 pickup trucks

While we many not care about 0.6% mpg, it makes a big difference to the automakers in meeting CAFE requirements.

HD trucks are supposed to get an average of 16mpg by 2027. Source: What New MPG Standards Will Mean for HD Pickups and Vans ?*News ?*Car and Driver | Car and Driver Blog

In general, a 0.01 improvement in drag coefficient (cD) is worth 0.1 mpg combined. Source: Improving Aerodynamics to Boost Fuel Economy

 

I'm posting all pics in the "We Own Work" thread. Check it out. Got all the towing and payload specs for each configuration.

 

No wonder my truck gets 11mpg... I'm missing the air dam!!

 

That's what a truck's supposed to look like, and is good to see