EV running costs after the RUC change: does a used Leaf still beat a petrol Aqua?

NZTA's light EV RUC rates took effect 1 July 2026. We run the real per-kilometre numbers for Leaf and Ioniq 6 owners against a petrol Aqua and hybrid Corolla at current second-hand prices.

The RUC exemption was always temporary. NZTA signalled that years ago, and from 1 July 2026 it ended. Light electric vehicles now pay $76 per 1,000km in road user charges, the same structure that diesel drivers have lived with since forever. The question is what that actually does to the running cost advantage EVs held over comparable petrol and hybrid alternatives at the used end of the market.

Let's put real numbers on it.

A Canterbury driver covering 15,000km annually now pays $1,140 a year in RUCs on a light EV. That's the flat cost before you've charged the thing. A Nissan Leaf, depending on age and battery state, uses roughly 17 to 20kWh per 100km in real-world Canterbury driving, which includes cold mornings, heated seats, and the occasional Arthurs Pass run. On a standard home tariff of around 30 cents per kWh, that's $765 to $900 in electricity for 15,000km. Add the RUC and you're looking at $1,905 to $2,040 a year in fuel and road tax combined.

A 2020 Toyota Aqua doing the same 15,000km returns around 4.5L/100km in mixed driving. At $2.70 per litre, that's $1,823 in petrol. No RUC. WoF costs are comparable across both. The gap has closed substantially.

What the Ioniq 6 changes

The Ioniq 6 complicates the picture because it's a more efficient car. A 2022 entry-spec Ioniq 6 is pulling 14 to 16kWh per 100km in real use, which drops the electricity bill to around $630 to $720 for 15,000km. Add $1,140 RUC and you're at $1,770 to $1,860 annually. That's marginally cheaper than the Aqua on fuel alone, and the Ioniq 6 is a considerably larger, better-equipped car.

The catch is purchase price. A tidy 2022 Ioniq 6 standard range is sitting at $27,000 to $30,000 on Canterbury yards right now. A 2020 Aqua with honest mileage is $18,000 to $21,000. You're paying $8,000 to $10,000 more upfront for the Hyundai. At the marginal running cost savings you're now looking at post-RUC, that gap takes a long time to recover.

The 2019 Leaf is the more interesting case. You can buy a 40kWh Leaf with 60,000 to 80,000km on it for $19,000 to $23,000. Battery degradation is the real variable. A well-kept example from a Japanese fleet source might still show 10 bars or better on the battery health indicator. A tired one might give you a real-world range of 180km on a full charge, which makes winter South Island driving genuinely stressful. At 15,000km and $76 per 1,000km, the Leaf now costs more to run annually than it did before July 2026 by exactly $1,140. The electricity savings over a petrol car shrink from compelling to marginal.

The hybrid Corolla as the benchmark

The 2021 Corolla Hybrid is the car that quietly wins this comparison for a lot of buyers. At $23,000 to $26,000 for a tidy used example, it slots between the Aqua and the Ioniq 6 on price. Its real-world fuel consumption in Canterbury mixed driving is around 4.2 to 4.8L/100km. At $2.70 a litre, 15,000km costs roughly $1,701 to $1,944 in petrol. No RUC. Battery is covered under Toyota's hybrid warranty trail. Parts are local. Servicing is straightforward.

It doesn't charge overnight. It doesn't get you the EV lane status that no longer exists anyway. But post-RUC, the cost-per-kilometre argument for choosing a Leaf over a Corolla Hybrid is thin. You're talking about a difference of a few hundred dollars a year at best, against a smaller range of vehicles that require more planning and carry more resale uncertainty.

None of this means EVs are a bad buy. The Ioniq 6 is a genuinely excellent used car if the price is right. The Leaf at $19,000 with a strong battery is still decent value for urban Canterbury use, where most trips are under 40km and home charging is available. But the RUC change removes the automatic financial logic that made EVs an easy yes at this price point. You have to actually model your own usage now, which is how it should be.

The honest summary: if you do low annual kilometres, the Aqua or Corolla Hybrid wins on simplicity and total cost. If you cover 20,000km-plus a year and have reliable home charging, the Ioniq 6 still makes a case for itself. The Leaf sits in an awkward middle, good enough to own, hard to recommend over the Corolla Hybrid at current pricing unless the battery is genuinely healthy and the purchase price reflects it.