13.6 Gallons
According to the 2005 Ford Mustang Owner Guide : The only gas tank size for the 4.0 litre V6 and the 4.6 litre V8 is ( 16.0 US. gallons )
16 Gallons, you can view the specs here ... http://www.edmunds.com/used/2005/ford/mustang/100379992/specs.html
16 Gallons maximum capacity.
16 gallons ( 60.6 liters ) according to the Owner Guide
The gas tank on the 2005 Ford Mustang holds 16.0 gal..
The 2005-2007 Ford Mustang fuel tank capacitie is 16.0 gallons
According to the 2005 Ford Mustang Owner Guide : All models have a ( 16.0 U.S. gallon / 60.6 liter gas tank )
I have a 2011 Mustang and it has a 16 gallon 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
it is located in the front of the gas tank