Average 20-22 mpg
18 MPG.
According to the 2000 Mercury Grand Marquis Owner Guide : ( The gas tank capacity is 19.0 U.S. gallons )
it gets 15 mpg's in city.....22 on Highway
ONE - located in the Gas Tank
I have a 1993 and i`m sure it`s the same as mine 18 city 25 on the road
I get 14-15 on a good day in my 2000.
According to a website I was looking at : For a 2005 Mercury Grand Marquis : ( 16 city / 23 highway / miles per U.S. gallon )
As much as the gas tank will hold... ---------------------------------------------------------------------------------------------- On a 1997 Mercury Grand Marquis , the gas tank capacity is ( 20.0 U.S. gallons )
No, just the opposite. Overdrive is an extra gear, the use of which, make the vehicle more economical.
The ( 2007 ) Mercury Grand Marquis has a ( 19 U.S. gallon tank )
If it could they wouldn't be on there in the first place. Truthfully, it'll run BETTER with them, if you take them off, your gas mileage will suffer.
According to my Chilton's Auto Repair manual : A ( 1987 ) Mercury Grand Marquis has a ( 20 U.S. gallon gas tank )