Mehta said the company honoured the price shown at the pump despite it being a mistake.
"If it's an error on our part we just charge [what is advertised]."
According to the Ministry of Business, Innovation and Employment's consumer protection website, in most cases, if a price is advertised or displayed incorrectly at a substantially lower price, a trader doesn't have to sell products at that price.
Gull has promised to not increase current fuel prices over Labour Weekend.
"Increasing prices on a Friday afternoon goes against Gull's philosophy of value to the motorist," said Mehta.
"This is the time that most Kiwi motorists are filling their vehicles for the much-awaited long weekend and increasing prices at this time takes advantage of a captive market."