I live in Australia too.
Fuel tax has not gone directly to roads since the seventies - it goes into general revenue.
Rego + fuel tax does not fund roads.
Local, state and federal gov all subsidise the building and maintaining of roads. Federal receives fuel tax, state receives rego. All three levels of government spend more on roads that they receive from motorists.
Add to that our activities in Iraq, exclusion from the proposed CPRS (Carbon pollution reduction scheme), and the hospital costs to handle all these obese Australians, and most cancers are reduced by an active lifestyle.
We also subsidise our car industry to produce technologically backward large cars.
No. Cars are recieving massive subsidies at the expense of cyclists.
Also look around at all the extra infrastructure - traffic lights extra lanes, car parks, parking spaces, garages etc, that are required to support this system.
Bikes cause less wear and tear, require far less road to be built, and require less insurance because they can damage less.
But don't think you are incorrect because of mere facts, take comfort being surrounded by a large percentage of Aussies who share your beliefs, which is why politicians feel the need maintain this system.