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Its easy; imagine two hungry samon that have to swim upstream to breed, one more aero (or hydro) than the other. They both have the same amount of energy stored as fat in them. The efficient fish will use less energy and make it's mate whereas the other fish will die. The surviving fish gets to breed and pass on its steamlininess whereas 3-box fish gets a Darwin award. Unfortunately there is no proverbial river that automakers have to swim up to create a new model... the just do whatever sells best.
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