Can any here actually swear that a car bra works? When I had a cheap car bra on my old Civic, before a wash, I would peel off the car bra and discover dirt and sand underneath it. So while it kept the bugs off, it sure wasn't keeping it clean. After a rock punctured the bra and dented the hood underneath, I've stopped using it. I've since concluded that it's more for looks than function.
Also, I would assume that the car bra would actually ruin the aerodynamics of the car. That old car bra had two "wind dam" type of protrusions from the top edge of the bra. I assume it was supposed to help keep the bra snug to the hood, keep it from flapping around. As mentioned, since dirt can still get into it, it was not only worthless, but probably ate away at my MPG.
My wife and I washed the Insight last weekend and discovered that we got a lot of chips all over the hood. The problem is that the chips are not all concentrated at the edge of the hood, but pretty much randomly distributed all over. I've went ahead and ordered a raw strip of 3M ScotchCal, and will experiment.
Charles