The 2015 Chevrolet Silverado 1500 is available as a 2-door, 3-seat regular side. Starting at $26,520, the 2015 Chevrolet Silverado 1500 WT 4x2 Regular Cab 6.5' Box is powered by a 4.3L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 24-mpg on the highway. The top of the line 2015ChevroletSilverado 1500High Country 4x4 Crew Cab 6.5' Box , priced at $ 51,890 , is powered by a 5.3L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway.