Fuel prices across New Zealand have climbed sharply, with diesel now only about 20 cents a litre cheaper than 91 petrol, narrowing the usual gap created by excise taxes and applying extra pressure on transport operators.
Data from the petrol-price monitoring app Gaspy shows the national average reported price for 91 petrol is $3.31 a litre, while diesel averaged $3.13. Premium 95 petrol has reached $3.51 a litre. Over the past 28 days, prices for 91 rose roughly 37.7 percent, while diesel surged about 81.8 percent.
Why diesel drivers and freight operators are being hit
Diesel typically appears cheaper at the pump because petrol carries a heavier excise component. In normal conditions, diesel might trade about 70 cents below 91 petrol, but that relationship has compressed to around 20 cents. At the same time, heavy vehicle operators still face road user charges in addition to fuel costs, so the cash impact on freight businesses is magnified.
Transport industry representatives warn the spike in diesel costs compounds a sector that already runs on tight margins. For many freight firms diesel is the second-largest expense after wages, commonly representing about 15 to 25 percent of overall operating costs depending on the industry. In grocery distribution diesel can account for up to 12 percent of costs, while in logging and other heavy industries transport can reach the higher end of that range.
Many businesses use fuel adjustment mechanisms to cope. Roughly half of Transporting New Zealand’s members were likely applying a fuel surcharge or adjustment factor to invoices, adding a variable charge on top of base freight rates to reflect recent diesel price movements. That surcharge can appear in invoices for retail, construction, logging and other sectors and represents a direct flow-on cost to customers.
Supply, demand and regional differences
Industry sources say fuel shortages are not widespread and that recent local supply issues appear driven more by demand patterns than by systemic shortages. The bigger concern for some economists is diesel availability at scale, because a lack of diesel would have broader economic consequences than short-term petrol outages for private motorists.
Gaspy’s reported cheapest 91 petrol in the dataset was at Orams Marine Village, a site serving boats where 91 was $2.96 a litre, followed by a Pukekohe supermarket site at $3.08. Regional and local pricing dynamics that historically produced cheaper areas are less visible at present. Discount days and retail competition that used to push down prices in some areas have been less common recently, reducing the usual downward pressure on local pump prices.
