Petrol prices have been fluctuating over the last couple of months, but it is hard to say whether pump prices will keep falling.

Motorists and most aspiring vehicle owners are expected to benefit from an increasingly competitive car business, diving petrol prices and falling levies.

Z Energy is warning it's facing a potential multi-million dollar bill from NZ Customs - backdated to 1986.

Iran, once OPEC's second-biggest producer, will boost its oil exports by 500,000 barrels a day immediately after sanctions are lifted

Government spends up to 20 times more money on wooing oil and gas companies to New Zealand than it does on promoting renewable energy, newly released figures show.

BP New Zealand generated its smallest earnings in more than a decade due to falling oil prices.

The Commerce Commission has indicated a timeframe on when it expects to make a decision the acquisition.

Kiwis can now use a beer byproduct to fill their cars, with a new biofuel being unveiled at an Auckland service station today.

Airline profits are expected to almost double this year to US$29.3 billion - amounting to US$8.27 per passenger carried.

Shares in Qantas surged to their highest level in more than six years after it said the global drop in oil prices would help cut its fuel bill by A$550 million ($593 million) this year.

A new report claims to have disproved a well established urban myth that petrol companies are quick to raise petrol prices, but slow to drop them when prices fall.

What people want from transport is to get from A to B as quickly, safely and cheaply as possible.

The price of oil is tumbling again, rattling an already-shaken oil industry and heralding lower prices for consumers.

Retailers are continuing to benefit from the boost to consumers' discretionary incomes from the fall in oil prices over the past year.

The results for the six months to December 2014 has been fairly lacklustre, with one notable exception, Brian Gaynor writes.

Virgin Australia is tipped to benefit more from fuel savings in the year's second half after reporting a sharp upturn in its latest trading update.

The golden run of cheaper petrol could be at an end with prices at the pump increasing for the first time in four months, AA says.

The Automobile Association has called for a ministerial inquiry into the cost of fuel as an informal survey found variations of up to $1.34 at different sites around the country.

The price of petrol keeps plunging but the savings are yet to ignite discounts for consumers elsewhere in the economy.

It has become standard for tough questions to be asked of oil companies when the price of petrol rises or falls dramatically.

Kiwis should have more disposable cash as petrol prices fall around the country, but consumer groups say the amount we fork out at the pumps should be lower still.

Petrol prices dropped for the 12th successive time this week and even better news appears to lie ahead for holiday motorists.

The sharp fall in oil prices is set to continue benefiting consumers but could delay exploration projects around New Zealand.

Air New Zealand chief executive Christopher Luxon expects low oil prices to stimulate demand for travel but for their beneficial effect on the airline's fuel bill to be muted by the fall in the New Zealand dollar.

Lower petrol prices contributed to a 0.1 per cent fall in the amount consumers charged to electronic cards last month.

Lower fuel prices are compounding the longest commodity slump in a generation.

Qantas boss Alan Joyce says fuel prices falling more quickly than the Australian dollar are helping revive the airline's international division but he's not putting a date on when it will be out of financial trouble.

New Zealand-founded LanzaTech's quest to commercialise its biofuel has taken another step with one of the world's biggest banks.

Z Energy boss Mike Bennetts says the return of $2 a litre petrol could be on the cards if oil prices continue to plummet.