The 2006 Chevrolet Colorado is available as a 2-door, 3-seat regular side. Starting at $18,330, the 2006 Chevrolet Colorado LS 4x4 Regular Cab is powered by a 2.8L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 18-mpg in the city and 23-mpg on the highway. The top of the line 2006ChevroletColoradoWork Truck 4x2 Extended Cab , priced at $ 17,330 , is powered by a 2.8L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 20-mpg in the city and 27-mpg on the highway.