Petrol price drop: Gull shaves 15c off per litre 15 Dec, 2020 07:10 PM 2 minutes to read Gull has taken 15c a litre off its prices in a pre-Christmas special. Photo / Jason Oxenham. Gull has taken 15c a litre off its prices in a pre-Christmas special. Photo / Jason Oxenham. NZ Herald Petrol chain Gull has dropped the price of all fuel at its stations from 7am today until midday Thursday. The 15c a litre discount will apply across its whole network and will see regular 91 drop to an average price of $1.717 per litre, $1.917 per litre for 98 and diesel drop to an average of 94.7c a litre.