Pick up your car in the city, not the airport. Grabbing your rental from a depot in Perth instead of right at the terminal can help you avoid extra location fees.
For trips during peak times like school holidays, book your car months ahead. For quieter periods, comparing options a few weeks out is usually fine.
WA means long drives, so choose a fuel-efficient car to save serious cash. A smaller car can easily save you $200 on a 2,000 km trip compared to a big SUV.
Here's a local secret for Perth: fill up your tank on a Tuesday. Prices drop every week on that day, so plan your refills to save a few bucks.