According to the 2000 Mercury Mountaineer Owner Guide :
( the gas tank holds 21.0 U.S. gallons )
22.5 gallons
According to the 2004 Mercury Mountaineer Owner Guide : ( 22.5 U.S. gallons )
According to the 2007 Mercury Mountaineer Owner Guide : ( the fuel tank capacity is 22.5 U.S. gallons )
22.5 U.S. gallons
79 liters or 20.86 gallons.
22.5 U.S. gallons ( 85 liters )
I believe it is ( 20.8 U.S. gallons )
For a 2000 Mercury Cougar : The tank holds ( 15.4 US. gallons )
19 gallons ( U.S. )
Well, it holds about 6 gallons, letting it role on for about 7 hours with a full tank hope i helped =========================================================== According to the 2006 Mercury Mountaineer Owner Guide : The fuel tank holds ( 22.5 U.S. gallons ) ( Helpfull )
According to the 2000 Mercury Grand Marquis Owner Guide : ( The gas tank capacity is 19.0 U.S. gallons )
21 U.S. gallons ( 79.5 liters )