15.4 Gal is what the owners manual says
According to the 1999 Ford Contour Owner Guide : ( all models have a 15.4 U.S. gallon fuel tank )
In terms of gasoline the Contour holds 15 gallons per Ford.com
15 gallons
The owners manual shows 16.2 / 16.3 gallons
If my 1999 Consumer Guide book is correct, the 1999 Ford Expedition holds 26 U.S. gallons.
According to the 1999 Ford Taurus Owner Guide : ( 16.0 U.S. gallons )
16.0 gallons for the SE, LX and SHO
15.5 U.S. gallons
According to the 1999 Ford Mustang Owner Guide : ( the fuel tank holds 15.5 U.S. gallons )
That is just over 12 gallons
The 1999 Ford Explorer owners manual shows ( 20.8 U.S. gallons ) for the 4 door
According to the 1999 Ford Ranger Owner Guide : ( the SuperCab gas tank holds 19.5 U.S. gallons )