The AA is advising motorists to shop around for petrol as more oil-producing nations slash production, raising Brent Crude prices to their highest in 17 months.
Eleven non-Opec countries struck a deal at the weekend to reduce output by 558,000 barrels per day (bpd) next year - the first such pact in 15 years.
It resulted in the price of Brent Crude soaring to its highest since July 2015, before falling back to US$55.80.
This followed Opec's announcement late last month that its members would reduce output by 1.2 million bpd to 32.5m for at least the first six months of 2017.
Wellington analyst Ian Twomey said the deal represented a concerted effort by oil-producing nations to increase the cost of oil, after it fell below US$30 a barrel earlier this year.