Dodge the airport tax. Picking up your car in Geelong CBD is often cheaper than at Avalon or Melbourne airports. A short shuttle ride could save you real cash.
Time your trip right. Rates are usually lowest during the winter months (June to August). If you're planning a summer or holiday trip, book a couple of months ahead to lock in a better price.
Think small for big savings. A compact car is easier on the wallet for both the rental price and petrol costs, and it's a better fit for the winding Great Ocean Road.
Compare rental lengths. A full week's rental can sometimes be cheaper than just 5 or 6 days. It sounds weird, but it's true, so always check the weekly rate.