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My thoughts:
The rear of a vehicle is significantly more responsible for drag than the front. Boat tails work extremely well. But, they're often not practical or aesthetic.
The next best thing is a short kamm and full underbody paneling. Throw in a partial grille block and you might buy yourself a few mpg. Change to the lowest RR tires you can find and pump them up, and you just might hit your goal.
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