Something happened in New Zealand this week that has never happened before. Diesel now costs more than 91 octane unleaded at the pump. The national average for diesel is $3.49 a litre. Regular 91 is $3.41. That inversion tells you everything you need to know about where this crisis is heading.
New Zealand imports 100 percent of its refined fuel. Every litre that goes into your tank arrived on a ship, mostly from refineries in Singapore, South Korea, and Japan. When the Strait of Hormuz was effectively blockaded in early March, the shockwave hit our supply chain within weeks. The last shipments from the Gulf are expected to arrive around April 20. After that, supply tightens further.
Here is what the numbers look like right now, and what you can do about it.
The National Picture
Across more than 1,000 stations tracked by Petrolmate, New Zealand fuel prices sit at:
- 91 Unleaded: $3.41 per litre average (ranging from $2.20 to $3.87)
- 95 Premium: $3.61 per litre
- 98 Premium: $3.74 per litre
- Diesel: $3.49 per litre (ranging from $2.20 to $3.90)
- LPG: $1.87 per litre
Petrol has risen roughly 35 percent since the start of the Hormuz crisis. Diesel has surged more than 87 percent in the same period. The reason diesel has overtaken petrol is that New Zealand's diesel supply is more exposed to disrupted Gulf shipping routes, and there are no substitutes for the heavy fleet. Every truck on the road, every piece of farm machinery, every construction vehicle runs on diesel. You cannot switch a logging truck to an EV.
What the Government Is (and Is Not) Doing
Unlike Australia, which halved its fuel excise on April 1, the New Zealand government has explicitly ruled out cutting fuel excise duty. Finance Minister Nicola Willis stated that officials had advised reducing excise would send the wrong signal when global fuel supply faces potential disruption of up to 20 percent. Spending too much, she warned, could lead to higher inflation and a vicious spiral.
Instead, the government announced a targeted relief package:
- $50 per week boost to the in-work tax credit for approximately 143,000 working families with children, starting April 7
- A further 14,000 families will become newly eligible
- The boost runs for one year or until 91 octane drops below $3 for four consecutive weeks
- Planned fuel tax increases have been paused
The government's longer term plan is to replace all fuel excise duty with road user charges, which diesel and electric vehicles already pay. But that transition does nothing for the motorist filling up this week.
Region by Region
Not every part of New Zealand is paying the same price. Here is where 91 unleaded averages stand across the regions tracked by Petrolmate's NZ coverage:
Cheapest Regions
- Bay of Plenty: $3.26 average
- Auckland: $3.26
- Wellington: $3.35
- Canterbury: $3.35
Most Expensive Regions
- West Coast: $3.52
- Tasman: $3.49
- Manawatu-Whanganui: $3.55
- Queenstown-Lakes: $3.43
The West Coast and remote South Island regions are consistently the most expensive, reflecting higher transport costs to get fuel to these areas. Auckland and Bay of Plenty benefit from proximity to the Marsden Point import terminal and higher station competition.
Brand by Brand: Who Is Cheapest?
If you have a choice of brands near you, the price differences are meaningful. Here is the average 91 unleaded price by brand across New Zealand:
- Pak'n Save: $3.32 (cheapest major brand)
- NPD: $3.32
- New World: $3.32
- Tasman Fuels: $3.35
- Waitomo: $3.37
- Gull: $3.38
- [Mobil](/brand/mobil): $3.41
- [Caltex](/brand/caltex): $3.42
- Z: $3.43
- [BP](/brand/bp): $3.45
- Allied: $3.45
- GAS: $3.46
- Challenge: $3.47
Pak'n Save, NPD, and New World are consistently 10 to 15 cents cheaper than the major brands. Gull and Waitomo sit in the middle. BP and Z are the most expensive of the big chains. That 15 cent difference on a 50 litre fill is $7.50 every time you visit the pump.
Where to Fill Up Right Now
The cheapest 91 unleaded stations in New Zealand today, according to live Petrolmate data:
- Gull Koutu (Rotorua): $2.20
- Pak'n Save Pukekohe (South Auckland): $2.63
- Caltex Hornby (Christchurch): $2.87
- Mobil Causeway: $2.89
- NPD Wigram (Christchurch): $3.22
- NPD Self Serve Papamoa (Bay of Plenty): $3.22
- Caltex Savoy (Invercargill): $3.21
Gull Koutu at $2.20 is an outlier, likely a promotional or transitional price. Pak'n Save Pukekohe at $2.63 is a genuine bargain. The Christchurch stations around $2.87 to $3.22 are worth the trip if you are nearby.
Price Signals: What Changed Overnight
Petrolmate's data intelligence detected 248 price movements across New Zealand in the last 24 hours:
- 146 significant drops averaging 11.9 cents, led by GAS stations dropping up to 30 cents
- 75 rising alerts averaging 6.6 cents, mostly diesel at Auckland stations
- 19 cheapest in area signals, flagging the best local deals
- 6 first to drop signals, identifying stations leading price reductions
The pattern is clear: petrol prices are easing slightly as some stations reset after the initial surge. But diesel continues to climb in the main centres, driven by genuine supply pressure rather than cycle dynamics.
The Diesel Problem
The real crisis in New Zealand is not petrol. It is diesel. The 87 percent price surge in a single month reflects something more fundamental than a price cycle. New Zealand's farming, manufacturing, and logistics sectors have no substitutes for diesel. You cannot run a combine harvester on an extension cord.
The government released an unscheduled fuel supply update on March 26 specifically because of diesel concerns. While there are currently no supply disruptions, officials warned that prices are expected to continue climbing in the coming weeks. The mid-April timeline, when Gulf shipments dry up, is the one to watch.
For businesses running a heavy fleet, the maths is brutal. A trucking company running 20 vehicles with 400 litre tanks went from roughly $740 per fill to $1,400. That cost flows straight to freight rates, which flows straight to the price of groceries, building materials, and everything else that moves by road.
What You Should Do
- Compare before you fill. Use Petrolmate to check nearby prices. The spread between cheapest and most expensive in your area can be 20 cents or more. That is $10 on a 50 litre fill.
- Fill at Pak'n Save, NPD, or New World where possible. They are consistently 10 to 15 cents cheaper than the major brands.
- Consider Gull and Waitomo as mid-range alternatives. They undercut BP and Z by 5 to 8 cents on average.
- Check the in-work tax credit. If you are a working family with children, the $50 per week boost from April 7 is designed to offset fuel costs. Check your eligibility at the IRD website.
- Watch diesel carefully if you run a business. The mid-April supply crunch is approaching. Consider topping up commercial tanks now if you have storage.
- Track price trends over the coming weeks. Unlike Australia, New Zealand does not have the same pronounced price cycles. Prices here tend to move with import costs rather than retail games.
What Comes Next
Treasury's worst case scenario, a prolonged conflict lasting through to the end of 2026, projects New Zealand inflation reaching 3.7 percent. The reality may be worse if the Strait of Hormuz remains closed beyond mid-April and Asian refinery output continues to drop.
New Zealand's vulnerability was laid bare when Marsden Point closed its refinery in 2022. We went from refining some of our own fuel to importing every drop. When global shipping lanes are disrupted, we feel it faster and harder than most countries.
The $4 per litre headline for 91 octane is coming. The question is when, not if. For diesel, we may get there sooner. Fill smart, track your prices, and plan your drives.
Jenny Nguyen covers fuel markets and consumer data for Petrolmate. Data sourced from Petrolmate's network of 1,000+ NZ stations and 14,000+ AU stations, MBIE, and NZ government announcements as of April 2, 2026.
