How much antifreeze to fill a 2005 mustang gt?

Answer:
According to the 2005 Ford Mustang Owner Guide :

The cooling system capacity is 13.6 quarts ( 12.9 liters )

So , a 50 / 50 mix of antifreeze and preferably distilled water would require :

( 6.8 quarts / 6.45 liters of antifreeze )

* Ford shows not to use less than 40 % antifreeze and not to exceed 60 % antifreeze in the cooling system mixture *
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