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2005 Mercury Grand Marquis Gas Mileage (MPG)

Unlike other fuel economy surveys, TrueDelta's Real-World Gas Mileage Survey includes questions about how and where a car was driven. So you can get an idea of the Mercury Grand Marquis's real-world MPG based on how and where you drive a car.

Reported MPG


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If you are not a TrueDelta member, you can see only five Mercury Grand Marquis MPG averages for each powertrain. Log in or join us to see them all.

Mercury Grand Marquis Gas Mileage

Year Body/Powertrain flat, hilly, or mountainousLand driving style: very light to "lead foot"Foot A/C use: none to heavyA/C constant stop and goTraf % many stops per mileCity % stop every mile or twoSub % fairly steady speedHwy % Hwy Spd MPG
2005 4dr Sedan 239-horsepower 4.6L V8
4-speed automatic RWD
flat med none 5 5 15 75 60 23.8
2005 4dr Sedan 239-horsepower 4.6L V8
4-speed automatic RWD
flat med none 5 5 15 75 60 23.8  
  Averages flat med none 5 5 15 75 60 23.8
With the 239-horsepower 4.6L V8 engine, 4-speed automatic transmission, and rear-wheel drive, 2005 Mercury Grand Marquis fuel economy has been averaging 23.8 MPG (miles per gallon).

The 2005 Mercury Grand Marquiss in this analysis were driven mostly on the highway at an average speed of 60 miles per hour (about 75 percent of the miles driven). The rest of the miles were in the suburbs (15 percent), in heavy traffic (5 percent), and in the city (5 percent).

In addition the average 2005 Mercury Grand Marquis in this analysis was driven on flat terrain with a medium foot and the AC not used at all.

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What Our Members Are Saying about the Real 2005 Mercury Grand Marquis MPG

2005 Mercury Grand Marquis Fuel Economy: Cons
Year Body/Powertrain Comment
2005 4dr Sedan 239-hp 4.6L V8 4-sp automatic RWD The V-8 is thirsty for city driving. The extra power would be nice for highway & mountain driving, though.