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|2009||2009 4dr Sedan 224-hp 4.6L V8 4-sp automatic RWD||19||
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|With the 224-horsepower 4.6L V8 engine, 4-speed automatic transmission, and rear-wheel drive, the 2009 Mercury Grand Marquis has been averaging 19 MPG (miles per gallon).
The 2009 Mercury Grand Marquiss in this analysis were driven mostly on the highway at an average speed of 70 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 2009 Mercury Grand Marquis in this analysis was driven on flat terrain with a medium foot and the AC on most or all of the time.