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It is like a 25/75 thing, the front can gain you 25% by optimizing it, and 75% of the gain potential can be had in the back. The reason is because even with a lousy front end, the air tends to build up and form it's own shape which is fairly decent. The back requires a careful shaping to keep air from forming pressure imbalances and to try to minimize pressure drag. Air does not form it's own shape their and improper shapes will upset the airflow which cannot be undone thus creating drag.
In a nutshell.
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