I don't think the real application is for autos - it is for aircraft. The reason airliners like American Airlines have a lot of silver showing is that paint = weight. A significant amount of weight when you consider the whole surface of these large aircraft. The additional weight means that that the aircraft require more fuel, which is even more weight. So this technique on airlines would mean less weight, and thus less fuel.
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I don't think the real application is for autos - it is for aircraft. The reason airliners like American Airlines have a lot of silver showing is that paint = weight. A significant amount of weight when you consider the whole surface of these large aircraft. The additional weight means that that the aircraft require more fuel, which is even more weight. So this technique on airlines would mean less weight, and thus less fuel.