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|2005||2005 4dr Sedan 239-hp 4.6L V8 4-sp automatic RWD||23.81||
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|With the 239-horsepower 4.6L V8 engine, 4-speed automatic transmission, and rear-wheel drive, the 2005 Mercury Grand Marquis has been averaging 23.81 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 city (5 percent), in heavy traffic (5 percent), and in the suburbs (0 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.