Quote:
Originally Posted by JulianEdgar
Ford in 'proper' testing found dimples increased drag.
As people have said, I don't think the bedliner coating will make any measurable difference - especially on that vehicle.
That said, on some specific parts (eg exterior mirror housings) a rough coating has been used to trip the airflow (changing it from laminar to turbulent in boundary layer), so reducing noise. (P 235 of my book, for people who have it.)
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mythbusters tested it but they made a small error by not removing the spoiler