Major oil companies dropped their petrol prices on Thursday for the second time in a week.
BP, Shell and Caltex have cut the price by three cents a litre, selling 91 octane for $1.63.9 a litre.
Mobil has also lowered its prices by three cents a litre, and Gull stations are selling 91 unleaded at $1.62.9 a litre.
A Caltex spokesperson says price cuts have been made possible by the strengthening New Zealand dollar and price improvements on the Singapore refined market.
Petrol prices have dropped by eight cents this week.