I went to Melbourne->Drive to Philip island->Sydney.

I rented Camry, only 1 full day, RM500++.

Oh, you masak sendiri, but why?

Sorry. I drove to Philip island and then the next day I drove back to Melbourne to return the car and board a plane to Sydney. 

in aussie, speed limit is speed limit. slowest car goes at 100kmh, fastest also 100kmh. so just turn on cruise mode and chill and release the pedal.

You wont face and J plate right signalling behind you or conti and alphart unkers flashing their high beams behind you or lane hoggers driving 80kmh in the middle lane causing you to brake hard. That makes it very relaxing to drive on their highway.... just have avoid falling asleep.

I still think 1k aud each is a bit much lah. Went there with a family of 4. Total including flight and all expenses for 4 people barely reach rm10k