The cost of petrol is climbing steadily towards pre-Covid levels, with 91 octane hitting its highest price in 18 months, Stuff reports. A recent weekly fuel price data from the Ministry of Business, Innovation and Employment (MBIE) shows a litre of regular petrol cost $2.36 for the week ended June 25. It is the highest price for regular petrol since January 2020, when a litre cost $2.38.