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I thought it might be a Holden. Can you give us some basic information on the car, such as weight, engine size, and government listed fuel economy?
Finally opened the link and looked at the article. From the pictures, I'd be terribly tempted to tape a block on that upper grill, and do some testing. You may be surprised. You may be able to maintain regulation water temperatures during your cool months. If the temperature gauge starts to rise, just take a quick moment to remove the grill block.
Of course, you can improve your fuel economy by limiting your speed. In the vast outback, I suspect that one wants to move rapidly, but confining speed to 55mph(90k/hr) would show significant improvement over 100 k/hr and the travel time isn't much different.
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