Starting in 2019 the RAM 1500 DT comes standard with two aerodynamics-focused moving parts:
A standard active air dam that lowers itself 2.5 inches from the front of the 1500 whenever the truck nears 35 mph. The exception is the Ram 1500 whose owners bought the air suspension option. This option drops the truck 0.6 inches. "The air dam would be scraping the ground", according to an FCA spokesman.
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The Ram 1500 also comes standard with active grille shutters, which can automatically close themselves when appropriate for optimal airflow. They’re located behind the grille.
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According to FCA, "The active air dam and active grille use “smart actuators” which “communicate directly with the vehicle’s control systems and ensure the aero systems deploy correctly, based on vehicle inputs such as speed, temperature and drive mode.” It is also reported that the active grille and air dam helps Ram 1500 DT drivers lose 7% of drag and save 1 mpg. “Across the Ram truck fleet, the active aero system is expected to save an estimated 10 million gallons of fuel annually,”
As already states, the -$85 is the amount deducted from the base price of the vehicle that does not come with this standard feature.