Interesting question, and one which I too have wondered about. Besides better contol of the A pillar vortex, I would guess there really wouldn't be any real benefit ( just a guess ) because the frontal area remains the same.
The first vehicle that comes to mind was the redesigned Dodge pickup trucks that started to use a seperate fender section apart from the main hood section. Dodge did put a bit of effort into trying to improve the aero of their trucks when they did the redesign in the mid nineties, but from what I have read, the sepetate grille and fenders were designed to resemble a semi such as the Kenworth T2000.
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