It's important to take photos of the fuel gauge when picking up and returning the car. The gauge appeared full when I picked up the car, but it wasn't actually full. I realized this after refueling; a full tank would cover over 700 kilometers, but the car could only go 605 kilometers when I picked it up. When returning the car, my tank showed 688 kilometers left, 83 kilometers more than when I picked it up. The rental company claimed I didn’t fill it up and charged me over 60 NZD. Fortunately, I took photos and the rental customer service helped resolve this issue for me. Based on my overall experience in New Zealand, I want to believe the rental company didn't do this intentionally, but their process needs to improve. Everything else was smooth. For Christchurch, you need to wait for their shuttle at the designated airport location. For Dunedin, simply park at the designated spot and return the keys to the counter.