That seems pretty high. I have the same truck and can get it as low as 11L/100km on the highway. City averages around 14L/100km.Originally posted by BDenali
2010 Sierra Denali Pickup - AWD with K&N
I'm lucky to get 400-425km per tank (90L Tank) with my 6.2, but I drive 90% in town and my foot is always into it.
On the highway the lowest I can get the fuel estimator down to is 13.5L/100km and in town 19L/100km.