I was only getting 350km's a tank so had a major service done. Found both oxy sensors not working also had the injectors sonic cleaned. Also had the vaporate's installed while getting the injectors cleaned hoping to get about 500 km's.
yer nice one dude, im only gettin about 310-340kms a tank in my vs, let us know how the service affected ur mileage.
Cheers
if that doesnt work, maybe do this.. my book says to change driving habbits..