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|2003||2003 4dr Sedan 204-hp 2.5L V6 6-sp shiftable automatic RWD||19.58||
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|With the turbocharged 241hp 2.0L I4 engine, 8-speed shiftable automatic transmission, and rear-wheel drive, the 2003 Lexus IS has been averaging 19.58 MPG (miles per gallon).
The 2003 Lexus ISs in this analysis were driven mostly on the highway at an average speed of 88 miles per hour (about 41.3 percent of the miles driven). The rest of the miles were in the city (32.5 percent), in heavy traffic (8.8 percent), and in the suburbs (0 percent).
In addition, the average 2003 Lexus IS in this analysis was driven on flat terrain with a medium foot and the AC on only some of the time.