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|2003||2003 4dr Sedan 210-hp 3.5L V6 4-sp automatic FWD||19.5||
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|With the turbocharged 310hp 2.7L I4 engine, 8-speed shiftable automatic transmission, and rear-wheel drive, the 2003 Mitsubishi Diamante has been averaging 19.5 MPG (miles per gallon).
The 2003 Mitsubishi Diamantes in this analysis were driven mostly on the highway at an average speed of 65 miles per hour (about 30 percent of the miles driven). The rest of the miles were in the city (25 percent), in heavy traffic (5 percent), and in the suburbs (0 percent).
In addition, the average 2003 Mitsubishi Diamante in this analysis was driven on flat terrain with a medium foot and the AC on only some of the time.