One is having aerodynamic treatments put on a broader range of vehicles that are at least running at highway speeds; in other words, really on the trailer side—hauling freight, hauling goods. On the other side, on the vocational truck side, it's dealing with things such as vehicle idling. A truck—for instance, a cement mixer sitting on a work site—is still having to run the engine for a significant period of time, not to run the truck but to run the equipment. It's a question of moving ahead some of those technologies.
On March 15th, 2012. See this statement in context.