According to user-based app Gaspy, diesel is the same cost as 91 without any discount applied, with both sitting at $3.39.
Over the weekend, petrol hit $4 a litre in some Auckland suburbs, with an average of $3.30 a litre for unleaded 91 and $3.69 a litre for unleaded 98 across the country.
Transporting New Zealand’s head of policy and advocacy Billy Clemens told the Herald the retail cost of diesel has increased 80% in the past month compared to 35% for 91.
“This is a lot considering standard fuel has a tax excise.
“It’s costing trucking companies a 15 to 20% increase in operating costs … this varies depending on the freight.”
Z Energy in Auckland’s Silverdale is selling 91 for 7c cheaper than diesel, if motorists use Z Rewards.
Clemens said they’ve written to the New Zealand Transport Agency to ask for higher pay loads.
“We’re wanting to increase the weight of how much a truck transporting goods [can carry] where safe and appropriate to do so.
“This would mean fewer trips and hopefully less cost handed down to the public.”
Transport sectors use a fuel adjustments factor to calculate rates, where some companies have already factored in a surcharge.
“We’re encouraging companies to be frank with their customers on why they may see prices at shelves increasing.”
Mobil Oteha Valley on Auckland’s North Shore is charging the same for its discounted 91 grade fuel and diesel. Photo / Michael Craig
AA’s Terry Collins said while diesel has “always been more expensive than 91″, the cost is now being passed onto consumers.
“Diesel has always been more expensive than fuel, outside of the pump, because it’s harder to extract than 91.
“But now the barrel price in say Singapore is $28 a barrel, up from $5 or $6 … this will have a massive impact on the price here.”
He used a past crisis as an example of how the world will need to “readjust”.
“We’ve seen this in 2008, we’ve seen it more recently with the Russia, Ukraine [war] … it’s all followed by recovery.
“Right now, they’ll be figuring out how to source the fuel in other ways.”
The Government announced yesterday a cash injection for working families to help with soaring prices at the pump.
More than 140,000 families with children will receive an extra $50 per week through a boost to the In-Work Tax Credit.
The increase would begin from April 7 and be paid weekly or fortnightly, depending on when people were paid. About 143,000 families would receive it, as well as about 14,000 families who received the tax credit at an abated rate.
Beneficiaries and superannuitants wouldn’t receive the boost, with the Government arguing their payments would be adjusted from April 1 as per normal.
The added payment would last for one year or until the price of 91-octane petrol drops below $3 a litre for four consecutive weeks.