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|2014||2014 4dr Crew Cab 5.5ft bed 315-hp 5.3L V8 6-sp shiftable automatic RWD||25||
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|With the 355-horsepower 5.3L V8 engine, 6-speed shiftable automatic transmission, and rear-wheel drive, the 2014 GMC Sierra 1500 has been averaging 25 MPG (miles per gallon).
The 2014 GMC Sierra 1500s in this analysis were driven mostly on the highway at an average speed of 63 miles per hour (about 85 percent of the miles driven). The rest of the miles were in the city (10 percent), in heavy traffic (5 percent), and in the suburbs (0 percent).
In addition, the average 2014 GMC Sierra 1500 in this analysis was driven on flat terrain with a light foot and the AC on most or all of the time.