According to a website I was looking at :
For a 2005 Mercury Grand Marquis :
( 16 city / 23 highway / miles per U.S. gallon )
I get 15.3 in my 2005.
According to the 2005 Mercury Grand Marquis Owner Guide : ( 19.0 US. gallons )
The EPA mileage estimate for the 2005 Jeep Grand-Cherokee is 15 mpg in the city, 21 mpg on the highway.
The EPA mileage estimate for the 2005 Suzuki Grand-Vitara is 17 mpg in the city, 21 mpg on the highway.
The EPA mileage estimate for the 2005 Dodge Grand-Caravan is 17 mpg in the city, 24 mpg on the highway.
The 2005 Mercury Grand Marquis typically achieves around 16 miles per gallon (mpg) in the city and about 24 mpg on the highway. This results in an average combined fuel economy of approximately 19-20 mpg. However, actual mileage can vary based on driving conditions and maintenance.
location of heater control valve on 2005 mercury marguis ?
owners manual.
on top of gas pedal
For a 2005 Mercury Grand Marquis : " regular " unleaded , 87 octane According to the Owner Guide
Unbolt it from the floor.
The 2005 Mercury Grand Marquis , 4.6 liter SOHC , V8 engine has ( 2 ) timing chains ( 1 timing chain to each cylinder head )