New Zealand Fuel Prices Drop as Unleaded 91 Falls 2.6% and Diesel Slides 12.43%

New Zealand drivers are seeing a clearer break in pump prices, with live fuel data showing broad falls across petrol and diesel after a month of steady pressure on household transport costs. The sharpest move is in diesel, where the national average has dropped by 45.17 cents over 28 days, a fall of 12.43%, according to the latest Gaspy figures.

The latest database update, recorded at 7:06am on 17 May 2026, shows the national average price for Unleaded 91 at $3.263. That is down 8.72 cents over 28 days, or 2.6%. Diesel is averaging $3.183, while premium grades remain higher, with Unleaded 95 at $3.454 and Unleaded 98 at $3.583.

The decline matters because fuel prices feed directly into weekly budgets for commuters, tradespeople, delivery drivers and families outside major public transport corridors. A fall of only a few cents per litre can still become noticeable over repeated fill-ups, while a double-digit percentage drop in diesel is especially relevant for small businesses, freight operators and rural motorists who rely heavily on diesel vehicles.

Diesel records the steepest 28-day fall

Diesel’s 12.43% fall stands out because it is much larger than the movement seen in regular petrol. The gap suggests that diesel users have had a more meaningful short-term reprieve than petrol motorists, even though average pump prices remain above the level many drivers would consider cheap.

Premium petrol has also moved lower, but by a smaller margin. Unleaded 95 is down 8.28 cents over 28 days, a fall of 2.34%. Unleaded 98 has dropped 13.4 cents, or 3.6%. The data shows that prices are easing across all major fuel categories, but the relief is uneven depending on the grade a driver needs.

For everyday motorists, the most useful comparison remains the spread between regular and premium petrol. At current averages, Unleaded 95 is about 19.1 cents higher than Unleaded 91, while Unleaded 98 is about 32 cents higher than Unleaded 91. That difference can become significant for drivers filling larger tanks or covering long distances each week.

The cheapest listed stations for Unleaded 91 show how much location still matters. Tasman Epsom in Auckland is listed at $3.025, making it the lowest among the five cheapest stations shown. New World Hutt City in Wellington, Pak ’n Save Tauranga in Bay of Plenty and Pak ’n Save Hutt City in Wellington are each listed at $3.057. U-GO Te Ngaengae in Wellington follows closely at $3.059.

Those figures highlight a practical point for drivers: the difference between the national average and the cheapest available stations can be large enough to influence where people choose to fill up. Compared with the Unleaded 91 average of $3.263, the cheapest listed price of $3.025 is about 23.8 cents per litre lower. On a 50-litre fill, that gap is close to $11.90.

Live price tracking is becoming more important for drivers

The latest Gaspy data also shows the scale of the price-tracking network behind these figures. The platform lists 2,470 fuel stations being watched today, 57 brands, 2,129,982 total Gas Spies and 79,925 price confirmations in the last seven days.

That volume of confirmations matters because fuel prices can shift quickly between regions, brands and even neighbouring suburbs. Gaspy describes itself as New Zealand’s comprehensive retail fuel price repository and says it sources thousands of fuel price observations from retail stores every day. The database covers daily prices for all fuel types, more than 1,700 stations over time, organised by brand and location, with historical records going back to November 2015.

New Zealand’s official fuel market is also monitored through public data, including weekly price tracking by the Ministry of Business, Innovation and Employment. For drivers, live crowd-confirmed data from Gaspy adds a more immediate view of what is happening at individual pumps, while official monitoring gives broader national context.

The latest numbers point to a softer fuel market than a month ago, particularly for diesel. But the wide spread between the national average and the cheapest listed sites also shows that savings are not automatic. Drivers who compare nearby stations before filling up may still find meaningful differences, especially in Auckland, Wellington and Bay of Plenty, where several of the lowest Unleaded 91 prices are currently appearing.