I can get anywhere between 350 and 450kms a tank, depending on where I'm driving. I use 98 octane petrol all the time.

Driving approx 2,000 kms (90% of that highway driving) cost me about $160 at Christmas time, but the petrol was cheaper then.

I filled the tank on the weekend and it cost me approx $60. If I wasn't driving all over Victoria this weekend it would last me a couple of weeks, but I expect to have to fill it by the time Sunday afternoon comes around.