EV road user charges are going up again — do the numbers still work?

RUC rates for light EVs rise again from October 2026. We crunch the per-kilometre costs for Leaf, Ioniq and MG ZS EV owners against petrol and diesel rivals to see if the sums still add up.

The argument for buying an electric car in New Zealand has always leaned hard on running costs. The purchase price premium is real, the range anxiety is real, and in Canterbury, so is the winter efficiency hit. What kept the sums honest was cheap electricity versus expensive petrol, and road user charges that were kept artificially low to encourage uptake. That era is ending.

From 1 October 2026, light EV owners will pay $76 per 1,000 kilometres in RUCs. That is up from $53 currently, and a long way from the $0 rate that applied before 2024. The government has signalled further increases are likely as it works toward full equalisation with petrol vehicles, which effectively pay around $76 per 1,000 kilometres through fuel excise duty at current pump prices. The direction of travel is clear.

So what does that actually mean per kilometre?

Breaking down the per-kilometre costs

At $76 per 1,000 kilometres, EV owners are paying 7.6 cents per kilometre in RUCs alone. Add in electricity. A typical home charge rate in Canterbury sits around 30 cents per kilowatt-hour. A Nissan Leaf e+ (the 62 kWh version) uses roughly 18 kWh per 100 kilometres in real-world conditions, which works out to about 5.4 cents per kilometre in energy costs. Combined, you're looking at roughly 13 cents per kilometre all-in on consumables, before tyres, insurance, or servicing.

A Hyundai Ioniq 6 is more efficient, closer to 15 kWh per 100 kilometres on a good day, which gets you to about 4.5 cents in energy and around 12 cents total with RUCs.

The MG ZS EV sits at the other end. Real-world consumption is closer to 20 kWh per 100 kilometres, particularly in cold weather. That pushes the energy cost to around 6 cents per kilometre and the total to nearer 14 cents.

Now compare that to a petrol CX-5, which burns roughly 8 litres per 100 kilometres and with petrol at around $2.70 a litre costs about 21.6 cents per kilometre in fuel alone. A Corolla hybrid, at 4.5 litres per 100 kilometres, comes down to around 12 cents in fuel. A diesel X-Trail, at 6 litres per 100 kilometres and diesel sitting around $2.20 a litre, costs about 13.2 cents in fuel, plus RUCs of $76 per 1,000 kilometres, which adds another 7.6 cents. That puts diesel at around 20.8 cents per kilometre.

Frankly, the EV still wins against a conventional petrol or diesel car by a meaningful margin. The Corolla hybrid is the one that actually makes the EV sweat.

What average Canterbury mileage looks like in dollar terms

Let's use 13,000 kilometres a year, which is a reasonable middle ground for a Canterbury driver doing school runs, weekend Mackenzie Country trips, and the occasional run up to Kaikōura.

At 13 cents per kilometre, a Leaf owner pays around $1,690 a year in combined RUCs and electricity. A petrol CX-5 driver is paying around $2,800 in fuel. The diesel X-Trail driver is paying close to $2,700. The Corolla hybrid driver pays around $1,560, which is actually slightly less than the Leaf, though the hybrid's purchase price is lower and it carries no RUC obligation.

The gap has narrowed. A few years ago, an EV owner might have saved $2,500 or more per year over a petrol equivalent. Post-RUC increases, that saving against a standard petrol car is still real but sits closer to $1,000 to $1,200 for average mileage. Against a hybrid, there is almost no running cost argument left.

For high-mileage drivers doing 20,000 kilometres or more, the EV case gets stronger again. The fixed-rate nature of RUCs means the percentage cost per kilometre doesn't change, but the raw saving over a thirsty petrol car compounds. At 20,000 kilometres, the Leaf owner saves around $1,800 on running costs over the CX-5 driver.

The honest verdict

The maths still work for most EV buyers, but they work less dramatically than they did two years ago, and anyone who bought an EV primarily on running-cost grounds deserves an updated set of numbers rather than the ones they used at the time.

The Leaf remains the most common EV on Canterbury roads and also the one most exposed to this change, because older Leafs are worth less, cost more to insure per dollar of value, and have degraded batteries that push real-world consumption up. A 30 kWh Leaf doing 18,000 kilometres a year in winter conditions is not the savings machine the original pitch suggested.

The Ioniq and newer ZS EV buyers are in a better position, largely because those cars are more efficient and hold their value well enough that the total ownership cost still favours electrification over a comparable petrol car across a four to five year period.

What the October 2026 increase does is remove the last of the free-ride pricing that was always a subsidy in disguise. EVs now have to justify themselves on realistic numbers. For most buyers doing average to high mileage, they still can. Just less comfortably than before.