People have tested rounded vs. blunt front ends (there's a separate thread on that), and even at freeway speeds, it just doesn't make a noticeable difference.
Think of it this way. In the front, you're pushing air out of the way. But in the back, the vaccum is sucking you back. Air is relatively easy to push, but vaccums are tough little things. Reducing the effect of the vaccum has a far greater effect than smothing out the "push" of the air, unless you're travelling well over 200 MPH.
Most rounded sports car fronts are for asthetics. If they were for function, they would have a short nose and a long tail- the opposite of what's considered attractive.
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