What EV owners actually pay per kilometre under the new RUC rates

NZTA's updated light EV RUC rates are now in effect. Here is what Leaf and Ioniq 5 owners will pay per kilometre in 2026, stacked against a comparable petrol car on real Canterbury distances.

The road user charge exemption that made early EV ownership feel almost too good to be true is long gone. New Zealanders buying a Leaf, an Ioniq 5, or a BYD Atto 3 in 2026 are paying RUCs from day one, and from this month they are paying slightly more than they were last year. The question worth asking is whether the EV cost advantage over petrol still holds up when you run honest numbers on Canterbury driving distances.

The short answer is yes, but the margin is thinner than the brochures suggest.

What the new rates actually cost

At $82 per 1000 km, a Nissan Leaf owner covering 14,000 km annually pays $1,148 in RUCs. A driver doing 18,000 km, which is not unusual for someone commuting from Rolleston or Rangiora into Christchurch and running weekend trips to Hanmer or the ski fields, pays $1,476. You buy RUCs in advance in blocks of 1000 km, so it is a real cash outlay, not an abstraction buried in a fuel price.

Electricity cost is the other variable. Home charging on a standard residential Meridian or Contact tariff sits around 29 to 33 cents per kWh in Canterbury right now. A second-generation Leaf with the 40 kWh battery uses roughly 16 kWh per 100 km in mixed driving, so home charging costs about 5 cents per km. Add the RUC and you are at 13.2 cents per km all-in on running costs, excluding servicing, tyres, and depreciation.

A 2020 Toyota Aqua on 91 octane at $2.70 per litre uses around 4.2 litres per 100 km in Canterbury conditions, which includes a dose of cold-weather heating load that hurts hybrids less than EVs but is worth acknowledging. That works out to 11.3 cents per km in fuel alone, with no RUC liability because petrol already carries fuel excise duty. The gap narrows considerably when you are comparing a Leaf against an Aqua rather than against a Hilux.

The Ioniq 5 changes the picture somewhat. It is a bigger car with a larger battery, and Hyundai's real-world consumption in mixed Canterbury driving lands around 18 to 20 kWh per 100 km. At 33 cents per kWh for home charging plus the RUC, you are looking at 14.1 to 14.7 cents per km in running costs. Its closest petrol comparison is probably a CX-5 petrol, which drinks around 8 litres per 100 km and costs roughly 21.6 cents per km in fuel. That gap is meaningful, around $1,000 a year on 14,000 km, and the Ioniq 5 wins it clearly.

Where public charging changes the maths

Home charging is where EV economics make the most sense. Public fast charging, which is what many apartment dwellers or people without off-street parking rely on, costs significantly more. ChargeNet's standard rate in Canterbury sits around 55 to 65 cents per kWh at DC fast chargers. Run all your charging through public infrastructure and a Leaf's per-km electricity cost roughly doubles, pushing total running costs to around 17 cents per km before you factor in the time cost of stopping to charge.

For my money, the honest version of the EV cost argument only holds if you have reliable home charging. Buyers without that option are often underestimating what they will spend.

The petrol baseline matters more than people admit

Here is what I think gets glossed over in most EV running cost comparisons: people choose their petrol baseline to make the numbers look good. A Leaf gets compared to a Corolla hatchback and the saving looks modest. That same Leaf gets compared to a petrol RAV4 and the saving looks huge. Neither is necessarily the right comparison. The real question is what you would actually buy if not the EV.

For a Canterbury family already looking at a seven-seater or an all-wheel drive for winter road trips, the Ioniq 5 AWD or a Kia EV6 versus a petrol X-Trail is a legitimate comparison, and the EV wins on running costs across any realistic annual distance. For a single commuter considering a second-hand Leaf against a second-hand Aqua, the numbers are close enough that you would make the decision on other grounds entirely.

The RUC increase from $76 to $82 per 1000 km is not going to reverse anyone's decision. It is an 8% lift on one component of a multi-part equation. What it does is remove any remaining pretence that EVs have zero road contribution costs, which was always a fiction that was going to have a use-by date. NZTA has been transparent that rates will keep moving toward parity with the equivalent fuel excise burden, so buyers should factor in further increases over the life of their ownership.

The EV running cost advantage is real. It is just not as large as it was three years ago, and in some comparisons it is narrower than the people selling you the car will volunteer to mention.