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I dunno, shovel, we do far better testing than they do. The kind of coastdown testing you read about here is generally valid, unlike Mythbusters' attempt to measure aerodynamic drag by measuring fuel consumption during a one mile run.
The reaction of the presenters upon revealing the mileage of the dimpled car was the same as mine. They realize an 11% improvement is impossible, but they go with it anyway, because it's a TV show.
My golf ball car testing (none at all) is better than theirs, because theirs will lead people to try out devices that, in theory, don't work on most cars, and whose effects are beyond the ability of most people to measure.
Cars should have creased rear edges. See the Prius spoiler, the Insight's sudden transition from sloped to vertical, the angular aft of a Volt, and similar details on Accords, Malibus, and Volvos. If your car has a round trailing edge, like the Taurus, it just might benefit from dimples, trip wires, vortex generators, etc. Still not enough to make up for the several inch thick layer of clay on the sides and top.
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