Hey guys, i have an au series 3 wagon, i bought it off a mate of mine, the problem i have is that it only gets 300 km to a tank of fuel, i have replaced the oxy sensor, the sensor on the side of the throttle body, i've cleaned the throttle body and reset the ecu, but the problem still remains, it doesn't blow any smoke and it also runs/idles smooth, has a slight missfire every now and again though, i haven't changed the map sensor, as i've been told if thats buggered then it'll blow black smoke?

leads and plugs have also been replaced

I would really like to fix the problem as my girlfriend is pregnant and cant afford to be spending 150 dollars a week on fuel!

Could anyone help me out?

Would be greatly appreciated.

Thanks in advance.

Does it have a leak some where it should be double that mileage easy

nope, no leaks, i tipped water around the injectors and manifold while it was running and it didn't do anything.

if you are going to look for a petrol leak you have to atleast not only check there but check from the tank along the fuel lines upto the fuel rail onto the motor