7 EV Myths Debunked: What the Data Actually Shows

The truth: EVs have far fewer moving parts than petrol cars and skip oil changes, timing belts and exhaust repairs. But they are not maintenance-free, and pretending otherwise sets owners up for disappointment.

Data from Norway, the world's most mature EV market, shows EVs accumulating inspection faults at a higher rate than petrol cars as they age: roughly 30% of EVs show faults at the 10-year inspection versus about 16% for equivalent-age petrol cars.

The common items: tyres (EVs are heavier and torquier, so tyres wear faster), suspension components (same weight story), brake fluid changes, cabin filters, and the 12V auxiliary battery. Software updates and battery coolant checks are also periodic requirements.

The correct framing: EVs are lower maintenance, not zero maintenance, with annual servicing typically costing a fraction of a petrol car's. Budget for tyres honestly; they are the EV's consumable.

The truth: real-world fleet data shows modern EV batteries retaining roughly 90% of original capacity after 8 years, with degradation slow and predictable rather than sudden.

Battery management systems control temperature, charge rates and cell balancing precisely to stretch longevity, and the data across hundreds of thousands of vehicles backs it up: high-mileage EVs routinely keep the large majority of their range.

Every new EV sold in NZ carries a battery warranty, typically guaranteeing 70-80% capacity retention for around 8 years or a generous distance cap. Real-world degradation usually runs well inside those thresholds, which is why capacity warranty claims are rare.

For used-EV buyers: battery health reports (from the manufacturer's app or third-party diagnostics) take the guesswork out. A 5-year-old EV with a verified healthy battery is a very different proposition from the myth's image of a dying appliance.

The truth: EVs are statistically far less likely to catch fire than petrol cars. The consistent international finding is roughly 25 fires per 100,000 EVs versus about 1,530 per 100,000 petrol and diesel vehicles.

EV fires make headlines precisely because they are rare and novel; petrol car fires are so routine they go unreported. A vehicle built around a tank of flammable liquid and a hot exhaust system was never the low-risk baseline people imagine.

The honest nuance: when lithium battery fires do occur they are harder to extinguish than petrol fires, which is why they get firefighting attention. Multiple protection layers (battery management, thermal barriers, automatic disconnection) are what make them so rare in the first place.

The truth: New Zealand's electricity system is unusually well suited to EVs. The grid is dominated by renewable generation, hydro above all, and like every grid it carries substantial spare capacity overnight, exactly when most EVs charge.

EV charging is also the most flexible large load a household owns. The car typically needs hours of charge and sits plugged in for longer; a smart charger or a cheap night-rate plan shifts the draw into the overnight trough automatically. Retailers already offer plans that reward this, and chargers with scheduling are standard.

Grid investment continues for many reasons, but "the grid cannot handle EVs" treats charging as if it all happened at 6pm on a winter Tuesday. With even basic scheduling, it does not.

The truth in NZ: this myth has a real kernel, RUC, and an honest answer.

Since 1 April 2024, light EVs pay Road User Charges of $76 per 1,000km, and any running-cost claim that ignores it is marketing. So count it: at about 35c/kWh home electricity and 15-20kWh per 100km, the all-in cost is roughly $12.85-14.60 per 100km including RUC, dropping to $8.65-10.00 on solar surplus.

A petrol car's comparable figure is its consumption times the pump price (excise included). At typical consumption and typical pump prices, the EV's all-in figure remains well ahead, before counting the servicing gap.

The myth survives by comparing a petrol car's fuel-only cost against an EV's electricity-plus-RUC, or vice versa skipping RUC. Compare all-in against all-in and the EV wins on running costs; see the full working in our charging cost guide.

The truth: public fast-charging networks now cover New Zealand's main state highways and tourist routes, and most modern EVs carry 400-600km of real-world range.

The arithmetic of an NZ road trip: legs between major stops are rarely beyond a modern EV's range, and a 20-30 minute fast charge while you grab coffee restores hundreds of kilometres. Trip planning apps (and the car's own navigation) handle charger locations automatically.

The deeper point: road trips are a small fraction of total driving. An EV charged at home covers the everyday entirely, at the cheapest rates available, and treats the occasional long trip as a solvable logistics question rather than a reason to burn petrol all year.

The truth: early short-range EVs did depreciate hard, and that history powers the myth. Modern long-range EVs behave much more like ordinary cars on the used market.

What changed: ranges that handle real life, battery health transparency (verifiable state-of-health reports reduce buyer fear), and a maturing used-EV market with enough volume for prices to find their level.

NZ-specific honesty: the market here absorbed real policy swings, the Clean Car Discount ending in December 2023 and RUC arriving in April 2024, and used values adjusted through both. A buyer today faces a more settled policy picture: no subsidies, known RUC, and a total-cost-of-ownership case that stands on running costs. Depreciation varies by model and brand far more than by drivetrain; research the specific car, not the category.