GMC Sierra دينالي 2012 Automatic Gasoline mileage: 300 KM or more 4WD Peace, mercy, and blessings of God be upon you: For sale: GMC Sierra Denali 6.2 Model 2012. Original body. There are scattered scratches and the paint is peeling at the beginning of the roof. Gear and engine are guaranteed. Mileage 300,000. The car is for sale by offer. It needs a few things to pass inspection.