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Ok the spoiler is mahusive, but there's a reason for this:

The Sports car regulations have a 'maximum width' for the spoiler, so audi (and all other competition cars) have used the maximum allowable.. and this logic is buried in physics... however in layman's terms: it is far more energy efficient to move a lot of air a short distance than a small amount of air a long distance, therefore this design produces the most downforce for the least drag.

...The same principle is the reason why the paddle-steamer was replaced by the propeller-driven boat, even though noither had spoilers!

Sorry for the Dr Spock answer!
 

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