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|MPG||Number of Vehicles|
|15 miles per gallon||1 vehicles|
|16 miles per gallon||0 vehicles|
|17 miles per gallon||1 vehicles|
|18 miles per gallon||3 vehicles|
|19 miles per gallon||2 vehicles|
|20 miles per gallon||1 vehicles|
|21 miles per gallon||0 vehicles|
|22 miles per gallon||1 vehicles|
|2003||2003 4dr Sedan 420-hp 5.6L V8 7-sp shiftable automatic RWD||18.43||
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|With the 420-horsepower 5.6L V8 engine, 7-speed shiftable automatic transmission, and rear-wheel drive, the 2003 Infiniti M has been averaging 18.43 MPG (miles per gallon).
The 2003 Infiniti Ms in this analysis were driven mostly on the highway at an average speed of 76 miles per hour (about 36.2 percent of the miles driven). The rest of the miles were in the city (33.4 percent), in heavy traffic (13.2 percent), and in the suburbs (0 percent).
In addition, the average 2003 Infiniti M in this analysis was driven on flat terrain with a medium foot and the AC on only some of the time.