GMC Sierra 2006 Automatic Gasoline mileage: 300 KM or more Peace, mercy, and blessings of God be upon you. I am offering a Sierra custom 2002, renewed and modified to 2006. The difference between the two models is negligible. The car's mileage is 406, and it is subject to increase. The car has been well-maintained, has a rare color, and was renewed by specialists in the Eastern Province, Haider and Abu Hazzah, who are visited from the Gulf countries. The car is very clean and a rare piece. The current offer is 42.