What it actually costs to run a Leaf, Aqua, or petrol hatch in Canterbury

RUC exemptions for light EVs are gone. Here's what the real per-kilometre numbers look like for Canterbury buyers choosing between a used Nissan Leaf, Toyota Aqua, and a comparable petrol hatchback.

A few years ago the used Nissan Leaf made a lot of sense on paper. Cheap to buy, cheap to charge, and no road user charges. That last part mattered. The RUC exemption was a genuine subsidy and buyers factored it in. Now it's gone, and the running cost gap between an EV, a hybrid, and a straight petrol hatchback has tightened considerably.

Let's put some actual numbers on it, using realistic Canterbury conditions and current pricing.

The Leaf: what RUCs actually add up to

A decent used 40 kWh Leaf, say a 2018 or 2019 ZE1, is sitting around $14,000 to $18,000 at most dealers right now. The 24 kWh older-generation cars are cheaper but the range anxiety is real once you account for battery degradation, and a cold Christchurch week doesn't help. Stick with the 40 kWh.

Charging at home on a standard residential tariff around 28 to 32 cents per kWh, the Leaf uses roughly 18 kWh per 100 km in real driving. That's about $5.40 per 100 km on electricity alone. Add RUCs at $76 per 1,000 km and you're adding 7.6 cents per kilometre, or $7.60 per 100 km. Combined running cost: roughly $13 per 100 km.

Over 15,000 km a year, RUCs alone are $1,140. That's real money, and it's money you're paying on top of power bills, not instead of them.

Service costs are low, tyres are normal, and WoF is annual after the first three years like anything else. But the RUC bill has fundamentally changed the maths.

The Aqua: the quiet winner

A 2021 to 2023 Toyota Aqua hybrid, the second-generation car with the bipolar nickel-metal hydride battery, is currently selling around $20,000 to $25,000. More upfront than a mid-spec Leaf, but the running costs are structured differently.

The Aqua returns around 4.0 to 4.5 litres per 100 km in real Canterbury use, which means mostly open roads, some city, no extreme alpine passes. At $2.70 per litre that's $10.80 to $12.15 per 100 km. No RUC. No separate charging infrastructure needed.

Over 15,000 km that's roughly $1,620 to $1,822 in petrol. Compare that to the Leaf's electricity bill of around $810 plus $1,140 in RUCs, which is $1,950 total. The Aqua is actually slightly cheaper to run per year than a post-exemption Leaf, and that's before you consider that the Aqua's residuals are holding better and servicing is straightforward at any Toyota dealer.

The Aqua isn't exciting to drive. The front end is light, the CVT does what CVTs do, and on a cold morning the transition between electric and petrol modes is noticeable rather than invisible. But it settles into its job reliably, and the running cost story is hard to argue with.

A petrol hatchback: cheaper upfront, more expensive per kilometre

For comparison, a solid used petrol hatchback in the same broad category, think a 2020 Mazda 2 or Honda Fit at $12,000 to $15,000, costs less to buy and nothing to charge. But it drinks considerably more fuel.

A realistic consumption figure for a 1.3 to 1.5 litre petrol hatch in mixed Canterbury driving is 6.5 to 7.5 litres per 100 km. At $2.70 per litre, that's $17.55 to $20.25 per 100 km. Over 15,000 km you're looking at $2,632 to $3,037 in petrol annually. That's meaningfully more than either the Leaf or the Aqua.

The petrol car wins on purchase price and simplicity. Familiar servicing, wide parts availability, no charging planning, no RUC odometer unit to manage. For someone doing genuinely low mileage, say under 8,000 km a year, the fuel penalty shrinks and the simplicity argument gets stronger.

Where the numbers land

At 15,000 km per year, the annual fuel and road cost ranking looks roughly like this: petrol hatchback around $2,600 to $3,000, Leaf with RUCs around $1,950, Aqua around $1,700 to $1,850. The Leaf used to be the clear winner. It isn't anymore.

The Aqua has moved into a position where it offers lower running costs than a post-exemption Leaf while costing more to buy upfront. The break-even on that price gap, roughly $4,000 to $7,000 depending on spec, depends on mileage and how long you keep the car. At 15,000 km a year you're probably looking at four to five years before the Aqua's lower running costs recover the purchase premium.

The Leaf still makes sense for buyers who do high daily mileage on a predictable route, have home charging sorted, and don't need to run the heater flat out in a Canterbury winter. The range on a degraded 40 kWh battery in cold weather is less than the spec sheet suggests. If your round trip is under 100 km and you charge at home every night, the Leaf is still viable. But the days of it being an obvious financial slam dunk are over.