Guys, there was a thread here not long ago where an aeronautical engineer weighed in. Basically, there are two forms of drag (I forget the terminology) and the drag associated with smooth, slippery surfaces doesn't come into play until you are travelling hundreds of miles per hour (aircraft speeds).
I love to wax my car to prevent the paint from drying out and or losing its color (and I love Rain-X, too ... been using it since 1985) but there is no efficiency issue with the condition of the surfaces of our cars (which is why Basjoos' FrankenCivic works so well despite it's rough fit and finish.
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--- Bror Jace
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