This has been common knowledge for quite some time. I can understand why it has not been done on commuter cars as I don't think it would be too attractive and not many people would like it, but on semis, trains, and plains, this could save so much energy it's ridiculous. The ONLY negative I see is repairs. It would be almost impossible to match a curved surface without replacing an entire panel. I would say, on a semi, train or airplane they probably replace the entire panel anyways because its cheaper to replace it then to keep the machine down for that long. I'm sure an engineer could come up with a easy way to manufacture dimples into it That will give a whole new meaning to VW Golf. But yeah, it's not that pretty. Maybe they can embed it using not so big, dimpled sheets. So when the surface gets damaged you won't be replacing that big of a piece. But then you would have a lot more connection points to the vehicle. Oh, science.