The 2006 Chevrolet Silverado 1500 is available as a 2-door, 3-seat regular side. Starting at $23,670, the 2006 Chevrolet Silverado 1500 LS 4x4 Regular Cab 8' Box is powered by a 4.3L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated 15-mpg in the city and 20-mpg on the highway. The top of the line 2006 Chevrolet Silverado 1500 Work Truck 4x4 Extended Cab 6' Box, priced at $00, is powered by a 5.3L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 19-mpg on the highway.