How many KM's per Tank should I be getting on my 2003 GMC Envoy?

[dolby63]

I have a 2003 GMC Envoy SLT short wheel base with the 6 Cyl Engine. Recently have done all maintenance including Spark Plugs, Fuel Filter, Air Filter and Synthetic Oil.

I am still only getting around 300KM per tank... is something wrong? What else can I try?

I most often will either drive in 2WD or AWD but seldom do I use the 4 wheel Hi or Low.
** also wanted to add tire pressure is good too... **

 

[Molson02536]

Tire pressure should be 32 psi. Try cleaning the MAF, you can pick up a can of MAF cleaner at Parts Source, Napa, and Auto Zone. A dirty MAF sensor is the number one cause of poor gas mileage. If your using a K&N or any other oil base free flow air filter, it's common for oil particles to gum up in the filaments on the MAF, causing poor gas mileage. Good luck and happy new years.