As of summer 2022, the average cost of gas in New Zealand is 3.06 NZD per liter. The minimum price in the nation is 2.79 NZD, and the maximum is 3.34 NZD. For comparison, the average cost of gas in Australia during this period is 2.12 NZD.
The average capacity of a fuel tank is between 40-70 liters. So, on average, it will cost you 122-214 NZD to fill one.