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Though being a yankee I am unfamiliar with the car, I can still make a few general recommendations which I think might well help:
1. If the car has an OBDII diagnostic plug under the dash, as U.S. cars beginning in 1996 must, then you should get a ScanGauge so that you can figure out how to drive the car for best fuel economy. You will never know what you are doing rightly or wrongly without some sort of instantaneous fuel consumption gauge.
2. Underbelly smoothing definitely helps on most cars. Do as much as you can.
3. A block heater will help if you are in parts which get cold on July nights ;-)
4. A grill block will help with both warmup and aero. But do watch your water temperatures carefully until you get the hang of how it works.
5. Rear fender skirts will help some.
6. Air the tires(tyres) to the maximum listed on the sidewall.
In the U.S. aeromodders frequently use a corrigated plastic sign board material called "coroplast" to make aero pieces such as fender skirts, underbelly pieces, and grill blocks. It is probably available from sign companies in Australia. Good luck.
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