What Canterbury EV owners are actually paying in RUCs now

Light EV road user charges have been back for a year. We break down the real per-kilometre cost for Leaf and Aqua PHEV owners against petrol equivalents.

The RUC exemption for light EVs ended quietly on 1 April 2024. No fanfare, no replacement scheme. The rate set by NZTA was $76 per 1,000 kilometres, the same as for light diesel vehicles. Plug-in hybrids had been paying $62 per 1,000km for years already. If you bought a Leaf in 2022 on the promise of zero RUCs and a Clean Car Discount, both of those things are now gone. Worth understanding what that actually costs you.

At 15,000km a year, a full EV owner is paying $1,140 in RUCs annually. A PHEV owner pays $930. Compare that to a petrol car doing the same distance: at 7L/100km and $2.70 per litre, that's around $2,835 in fuel costs. At 6L/100km it's $2,430. So the EV is still cheaper to run in energy and road-use charges combined, but the margin has narrowed considerably from what it was pre-April 2024.

The Leaf numbers in plain terms

A 2018 Nissan Leaf with the 40kWh battery is sitting at $18,000-$23,000 in the Canterbury used market right now, depending on condition and where the battery health sits. The 24kWh ZE0 generation is cheaper, $10,000-$14,000, but the range is limited enough that it changes your driving behaviour in ways that start to grate on longer South Island runs.

Charging a 40kWh Leaf at home on a standard residential tariff around $0.28-$0.32 per kWh costs roughly $11-$13 for a full charge, giving you a real-world 200-240km in Canterbury winter conditions. That works out to about 5-6 cents per kilometre in electricity. Add the RUC at 7.6 cents per kilometre and you're at 12-14 cents per kilometre all-in for energy and road use. A comparable petrol car, say a 2018 Toyota Corolla doing 7L/100km at $2.75/L, is at about 19 cents per kilometre just in fuel, before RUCs don't apply.

Over 15,000km a year, the Leaf owner is spending roughly $1,800-$2,100 on electricity and RUCs combined. The Corolla owner is spending around $2,900 in petrol. That's still $800-$1,100 a year in the Leaf's favour. It's not nothing, but it's not the $2,000-plus annual saving people were quoting two years ago when petrol was higher and RUCs were zero.

Servicing on the Leaf is genuinely cheaper. No oil, no timing chain, simpler brakes because of regenerative braking. Budget $300-$500 a year for a Leaf versus $600-$900 for a petrol equivalent once you're past warranty. Tyres are similar money. The risk factor is battery degradation: a Leaf that shows 10 out of 12 bars on the battery health display has lost meaningful range and a replacement battery from Nissan is not a cheap conversation. Used replacement packs through importers exist for $3,000-$6,000 fitted, which is liveable, but it's a cost to factor in when you're buying at 80,000km.

What the Aqua PHEV actually is

The Toyota Aqua plug-in is a different proposition and slightly misunderstood in the NZ market. Most Aquas here are the standard hybrid, not the plug-in variant. The GR Sport and crossover versions with plug-in capability are less common. Worth clarifying which one you're actually buying, because the PHEV version qualifies for PHEV RUC rates ($62/1,000km) and delivers meaningful electric-only range of around 25-35km, while the standard hybrid has no plug, no RUC liability at all because it runs on petrol, and gets taxed at the pump like any other car.

For a standard Aqua hybrid, which is probably what most people comparing it to a Leaf are actually looking at, the running cost story is built entirely on fuel economy. These cars genuinely do 4.5-5.5L/100km in mixed Canterbury driving. At $2.75/L and 15,000km a year, that's $1,856-$2,269 in petrol. No RUCs, no home charging infrastructure needed, no battery anxiety. Servicing is cheap, parts are everywhere, and the powertrain has a long track record of durability past 200,000km.

The Aqua hybrid isn't trying to be an EV. It's a very efficient petrol car that happens to use a battery to manage its own energy. On pure running costs at current petrol prices, it comes close to matching a Leaf once RUCs are in the picture, and it removes a lot of the ownership complexity.

Whether the sums still stack up

For someone doing mostly city and suburban kilometres, charging at home overnight, and keeping the car five or more years, the Leaf still makes financial sense at current pricing. The breakeven on energy costs versus a comparable petrol car is around three to four years depending on your driving pattern and what you paid for the car.

For someone doing regular Christchurch-to-Timaru or Christchurch-to-Queenstown runs, charging on the road at commercial rates of $0.45-$0.65 per kWh, the numbers tighten fast. At $0.55/kWh, your Leaf's per-kilometre electricity cost jumps to around 10 cents before RUCs. Add 7.6 cents RUC and you're at 17-18 cents per kilometre, which is barely better than a reasonably efficient petrol car and worse than a good diesel.

The EV running cost advantage hasn't disappeared. It's just been trimmed to the point where it no longer sells itself. You have to actually look at how you drive.