Since 2005, the Gen III HEMI engine (which, fun fact, aren't actually hemis) has sported a feature called MDS, standing for Multi Displacement System, the first of its kind in its respective vehicle ...

Displacement on demand has been a fuel-saving technology for light-duty gasoline engines for several years now. The technology also holds promise for diesel engines – but in a slightly different way.

Chrysler Group said it will offer the Multi-Displacement System (MDS) to its Ram trucks equipped with the HEMI engine. Currently the Chrysler 300C, Magnum R/T and HEMI-powered Jeep Grand Cherokee ...