Mr Bain said he had recently filled up in Tokoroa, where the price was 21 to 23 cents cheaper than in Whangārei.
"Something is not right when fuel is cheaper in the Far North than in Whangārei when it's refined in our own backyard. [Fuel is piped from the New Zealand Refinery at Marsden Pt to an adjacent truck loading facility from where deliveries to Northland service stations are made].
"Why is it that Northlanders are paying so much more for fuel than those in other parts of the country?" he asked.
Gull New Zealand general manager Dave Bodger said about 18 months ago, he drove around Northland and identified places where the company could set up shop.
Kaitaia had a "good-sized community" supporting retail giants such as The Warehouse and Pak'nSave, and he believed there was also room for Gull.
The company has an unmanned service station in Waipapa, while Waitomo has a 24-hour fuel stop in Paihia.
Meanwhile New Zealand has the sixth-lowest fuel tax in the world after Mexico, Chile, the United States, Canada and Australia. Currently just under a third of the pump price is the actual cost of refined petrol, while taxes comprise 63.78c a litre in excise (excluding the 10c/litre Auckland Regional Fuel Tax), 6.2c for the Emissions Trading Scheme and 13 per cent GST.
On Friday 91 octane was selling at 209.9 at BP and Caltex in Kerikeri, 219.9 at Caltex in Maungaturoto, 226.9 at BP in Kaitaia and Dargaville, and 215.9 at BP on Maunu Rd in Whangārei.
Diesel was 162.9 at Mobile Dargaville, 154.9 at Mobil Kamo and BP Maunu Rd, 162.9 at BP Kaitaia, 147.9 at BP and Caltex in Kerikeri, and 146.9 at Caltex in Maungaturoto.