EV road user charges after a year: do the numbers still work for Canterbury buyers?

Light EV road user charges have been running for over a year. We crunch what Canterbury Leaf and Prius owners are actually paying versus what they're saving at the pump.

The RUC exemption for light EVs was always a policy that had an expiry date. When it ended in April 2024, most EV owners had a fair warning. What's surprised people is how quickly $76 per 1,000km accumulates if you're doing real distance, and how that changes the comparison with a petrol hybrid that was always cheaper to buy.

A Leaf owner covering 15,000km a year now pays $1,140 in RUCs annually. That's before you touch tyres, servicing, or insurance. A Prius hybrid owner doing the same distance pays nothing in RUCs and burns roughly 750 litres of 91 octane at current Christchurch prices, which sits somewhere between $1,875 and $2,250 depending on the week. So the Leaf still saves money on energy costs, but the gap has narrowed from where it was in 2022 and 2023 when petrol was touching $3.20 and EVs paid no road tax at all.

What the real numbers look like

Home charging in Christchurch on a standard residential overnight rate runs around 28-32 cents per kWh. A Nissan Leaf 40kWh (the ZE1 generation that makes up most of the under-$20,000 market) uses roughly 18-20kWh per 100km in mixed driving, more in winter when the heater chews into range and battery efficiency drops in the cold. Call it $5.50-$6.50 per 100km in electricity, versus $9-$11 per 100km for a 2018-2020 Prius on petrol at current pump prices.

Add the RUC and the Leaf's effective per-100km cost rises to around $13.10-$14.10. The Prius sits at $9-$11. The hybrid wins on running costs at current prices, depending on how far you drive. At lower annual kilometres, say 10,000 or under, the Leaf still comes out ahead. Above 18,000km, the Prius starts to look very reasonable.

What this doesn't factor in is purchase price. A clean 2018 Nissan Leaf ZE1 30kWh with honest Canterbury history is sitting at $12,000-$16,000 right now. A 2018 Toyota Prius in similar condition runs $14,000-$20,000, with the plug-in PHEV variants pushing higher again. So the Leaf still offers a cheaper entry point for a lot of buyers, and cheaper servicing: no cambelt, no transmission fluid, brake pads that last longer due to regenerative braking.

What breaks, and what it costs

At 80,000-120,000km, which covers most of the affordable Leaf stock right now, the main concern is battery state of health. The 30kWh first-gen Leaf has a well-documented battery degradation issue in hot climates, though Canterbury's milder summers have been kinder than Auckland or Hawke's Bay. Expect 85-90% capacity on a well-used 30kWh example, which translates to a real-world winter range of 130-160km. For Christchurch city commuting that's enough. For a run to Queenstown it isn't.

Battery replacement on a 30kWh Leaf, if you go the reconditioned import route through NZ suppliers, is roughly $5,000-$8,000 fitted. New old-stock is more. The 40kWh ZE1 holds up better and commands a $3,000-$4,000 premium on the used market, which is usually worth paying if you're keeping the car long-term.

The Prius at similar mileage is generally more predictable. Hybrid battery replacements run $2,500-$4,500 depending on generation, and the fourth-gen (2015 onwards) has a better track record than the third. Inverter coolant pump failures are a known item on third-gens at around 150,000km. It's a $400-$600 repair if caught early, considerably more if the inverter overheats. Worth asking about service history before you buy.

Whether it still makes sense in 2026

For someone driving 10,000-12,000km a year around greater Christchurch, who can charge at home overnight, and who is buying in the $12,000-$16,000 range, a Leaf still makes sense. The RUC cost is real but manageable at that distance, the servicing is cheap, and you're not spending on petrol. The break-even on running costs versus a comparable petrol car is still achievable within two or three years of ownership.

For someone doing 20,000km plus, with no home charging, who needs to rely on public fast chargers, the arithmetic shifts significantly. Public charging in Christchurch on a ChargeNet fast charger runs 65-85 cents per kWh depending on membership and time of day. At that rate, electricity costs more per kilometre than petrol in a Prius, and then you're still paying RUCs on top. That buyer should probably be looking at a hybrid, not a BEV.

The Prius remains one of the most sensible used-car purchases in New Zealand for drivers who cover genuine distance. It doesn't require infrastructure, it doesn't require behaviour change, and the running costs are predictable. It's a less interesting car to own. That's fine. Most cars are tools.

The Leaf still has a place, but buyers need to go in clear-eyed about RUCs, battery health, and their actual charging situation. The deal isn't as obvious as it was in 2022. It's still a deal for the right buyer.