According to the 1996 Ford Mustang Owner Guide :
All models have a ( 15.4 U.S. gallon / 58.3 liter gas tank )
The 1998 Ford Mustang is a FOURTH GENERATION Mustang, therefore it has a fuel tank capacity of 15.4 US gallons.
16.0 Gallons
16 gallons
According to my Chilton's Auto Repair Manual : A 1989 Ford Mustang has a ( 15.4 U.S. gallon gas tank )
The 2009 Ford Mustang V6 & V8 have 16 gallon fuel tanks
According to my Chilton's Auto Repair Manual : A 1990 Ford Mustang has a ( 15.4 U.S. gallon gas tank )
58.7 liters ( 15.5 U.S. gallons ) is the gas tank capacity on a 1999 Ford Mustang
15.4 gallons
According to my Chilton's Auto Repair Manual : A 1988 Ford Mustang has a ( 15.4 U.S. gallon gas tank )
A 1996 Ford Mustang GT , 4.6L V8 engine : Has ( 1 ELECTRIC fuel pump INSIDE the fuel tank )
15.7 U.S. gallons ( 59.4 liters )
According to the 2013 Ford Mustang owners manual : ( 16.0 U.S. gallons / 60.6 litres )