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From a DIY standpoint, the biggest stumbling block of this approach is figuring out how best to apply it to a particular vehicle.
With boat tails, Kammbacks, wheel skirts etc., we can fairly easily see whether the air likes them or not by tuft testing.
But there's really no easy way for the backyard aerodynamicist to visualize the best position/angle/flow rate of a compressed air device without a wind tunnel. We can't tape tufts onto air behind the vehicle!
You could guess, and then do coastdown testing, but it's very time consuming and getting good data in on-road testing is very hard.
Until one of us comes up with a way to smoke test our cars...
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