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Somewhere on here there is a topic about sharp edges and kammbacks. If I remember right the ideal curve was around 4" or something. So that is why the edges are rounded off. It would have been way easier to make something square, but I think this works and looks better to.
I'm not exactly sure how much the tailbox helped my mileage, but I think it is somewhere between 1.5 to 2.5 MPG. I do notice it when the tailbox is not on the car.
I now drive without the tailbox and without full wheelcovers (because of work), and I can feel that the car has more trouble fighting trough head-on and crosswinds. I also noticed that my vacuum gauge is reading lower than with the wheelcovers and tailbox. They make a notable difference.
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