The 2005 Chevrolet Silverado 1500 is available as a 2-door, 3-seat regular side. Starting at $25,735, the 2005 Chevrolet Silverado 1500 LS 4x2 Regular Cab 8' Box is powered by a 4.8L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 21-mpg on the highway. The top of the line 2005ChevroletSilverado 1500SS 4x2 Extended Cab 6.5' Box , priced at $ 35,590 , is powered by a 6.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 19-mpg on the highway.