According to my Chilton's Auto Repair Manual :
A 1987 Ford Mustang has a ( 15.4 U.S. gallon gas tank )
16 gallons
15.7 gallons
Your gas tank will hold 16 gallons of fuel
The 2007 Ford Mustang V6 fuel tank holds 16 gallons The 2007 Ford Mustang V8 fuel tank holds 16 gallons
The fuel tank capacity is ( 16 gallons ) on the 2008 Ford Mustang
16 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 2007 Ford Mustang Owner Guide : The fuel tank capacity is ( 16.0 U.S. gallons )
My 1991 Ford Mustang was 15.4 U.S. gallons , I assume the 1992 would be the same
16.0 Gallons