if you look under the hood on the front radiator support there is usually a tag stating the amount of freon required for the system should be about 12oz if the tag is not there your local Ford dealer should be able to give you this information.
The fuel tank capacity is ( 16 gallons ) on the 2008 Ford Mustang
16.0 Gallons
15.5 gallons
15.7 gallons
The fuel tank capacity is ( 15.5 gallons ) according to the 1999 Ford Mustang Owner Guide
The 2005-2007 Ford Mustang fuel tank capacitie is 16.0 gallons
According to the 2003 Ford Mustang Owner Guide : ( 15.7 U.S. gallons )
15.7 gallons
16.0 U.S. gallons
15.4 gallons
15.4 US Gallons
16 gallons