15 mpg city, 22 highway for a combined average of 18 mpg. (Data published by the EPA)
18 MPG.
16 city 24 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.
Average 20-22 mpg
it gets 15 mpg's in city.....22 on Highway
With a 4.6 L engine, on the hi-way, you should get around 28 MPG. Have the injectors checked, timing, and sensors.
about 18 city and 24 highway
about 7-13 mpg
19 gallons, but it only gets 18 MPG. I found this info out on DriverSide.com, you can find more specs there for other cars.
20 mpg City 27-28 mpg Hwy
I have an 04 Grand Prix and I average around 22-24 mpg city, and as much as 31 mpg highway.
19 mpg city and 28 mpg hyway