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The 2018 Dodge Ram is equipped with a feature called MDS, which stands for multi displacement system. This system deactivates selected cylinders while driving at highway speeds to enhance fuel efficiency. The purpose of deactivating cylinders is to reduce the output power needed to maintain speed on the highway. MDS comes standard only on the 5.7L V8 engine; if you opt for a different engine, you won't have cylinder deactivation capabilities.
The Multi-Displacement System (MDS) is a technology where a powerful engine can reduce its number of cylinders during low-demand situations to enhance the vehicle's efficiency. In the case of the 2018 Ram 1500s, the 5.7 liter Hemi engine models are equipped with this feature. These models include the Lonestar Silver crew cab 6.3Ft SB in both RWD and 4WD, Lonestar crew cab 6.3Ft SB in both RWD and 4WD, Harvest crew cab 6.3Ft SB in both RWD and 4WD, Tradesman crew cab 6.3Ft SB in both RWD and 4WD, Limited crew cab in 5.6Ft SB (RWD and 4WD) and 6.3Ft SB (RWD and 4WD), Longhorn crew cab in 5.6Ft SB (RWD and 4WD) and 6.3Ft SB (RWD and 4WD), Laramie crew cab 6.3Ft SB in both RWD and 4WD, Sport regular cab SB, Sport crew cab 6.3Ft SB in both RWD and 4WD, Big Horn crew cab 6.3Ft SB in both RWD and 4WD, Night regular cab SB, Night crew cab 6.3Ft SB in 4WD, Rebel crew cab 5.6Ft SB, and SLT Fleet crew cab 6.3FT SB in both RWD and 4WD.