Ave Fuel per tank
I have SS 2006 Mod Manual bought 2007 Mar, it now has 155K and still on average I am getting 600-700 klms per tank,
I have extractors, full exhaust , high flow cats, a tune, CAI and an underdrive pulley kit and I also run Iridium Spark Plugs.
The add on's only owe me $2700...