Auto manufacturers spend a great deal of time trying to improve airflow over and around vehicles so the need for something like this isn't needed. We, on the other hand are driving vehicles that never saw the inside of a wind chamber and are shaped like a brick.
There have been studies about fuel savings and they report max increase of 8%, the manufacturer reports 5% max. I am interested in possible wind buffeting improvements from vehicles passing me from behind. If they came in light brown I would probably try them.
here is the link to a study if you are interested:
http://airtab.com/Site/documents/cas...s-on-truck.pdf
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