Originally Posted by
bigvuth
Let's say I first rent a car at the Brisbane International Airport. If I take a roadtrip to Cairns and back, it's 2100 miles. First of all how much does this cost in terms of extra mileage for car rental? Second are there any agencies with unlimited mileage? Third how likely is this to change in let's say four to five years? That's when I want to visit since I will have sufficient funds.
Save as much as you can, then come back in 3-5 years to ask your questions.
No point speculating now on airfares and other costs 5 years in the future.