The U.S. Department of Energy established the SuperTruck program in 2009 with the goal of developing and demonstrating technologies that can vastly improve the efficiency of Class 8 over-the-road trucks. Several teams participated in the program and developed prototypes that demonstrated more than double the fuel economy of conventional trucks. As part of the High- Efficiency Truck Users Forum program CALSTART investigated the approaches taken by the different teams and analyzed the military applicability of the technologies that were employed.