Cargo trucks gulp about 40 percent of the fuel pumped in the U.S. While most consumer attention focuses on improving the fuel economy of consumer vehicles, a major opportunity goes rumbling by. “Folks do not realize that the fuel use of even a small truck is equal to many, many cars,” says Bill Van Amburg, senior vice president of Calstart, a clean transportation technology nonprofit, and director of the Hybrid Truck Users Forum. “A utility truck as a hybrid would reduce more petroleum than nine Priuses.”