According to my Chilton's Auto Repair Manual :
For a 1991 Mercury Topaz ( front wheel drive )
( 15.9 US. gallons )
The 1991 Mercury Topaz has a fuel tank capacity of around 13.5 gallons.
11 us gallons
According to my Chilton"s Auto Repair Manual : For a 1991 Mercury Cougar ( 19.0 US. gallons )
It can hold about 13 gallons
typically the 1992 Mercury Sable can hold up to 16 gallons
22.5 gallons
2.6 gallons
( 26 gallons ) U.S.
20.0 gallons for Mercury Villagers '93-'98.
The ( 1996 ) Mercury Cougar gas tank capacity is ( 18.0 U.S. gallons )
19 gallons ( U.S. )
( 16 ) U.S. gallons