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Because it looks kinda funny?
You could ask the same question about, for example, rear bumper covers with squared off trailing vertical corners that promote clean flow separation. They are fitted to higher efficiency versions of otherwise regular high volume models like the Fit EV (but not on the regular Fit), or the Camry Hybrid (but not on the regular Camry), and the Accord Hybrid (but not the regular Accord). Automakers say the sharp trailing edge design reduces Cd, so why don't they just do it across the model line?
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