Road User Charges (RUC) for Diesel
In New Zealand, diesel is not taxed at the pump. Instead, Road User Charges (RUC) are paid in advance for the distance you drive. You buy a RUC licence (kilometres) from NZTA, NZ Post Shops, AA, or online; the licence is tied to your vehicle’s odometer. You must buy more before you run out of kilometres. Rates depend on vehicle type and weight — e.g. light diesel vehicles (under 3,500 kg) have a lower rate per 1,000 km than heavier ones. Check NZTA RUC rates and use the RUC calculator for current costs. A small admin fee applies per transaction.
Petrol: Tax at the Pump
Petrol (and petrol hybrids in some cases) has fuel excise included in the pump price, so you don’t buy RUC. What you pay at the pump is your fuel tax. Petrol campervans (e.g. many Toyota HiAce, Estima, Previa) are simple from a tax perspective but often use more fuel per kilometre than an equivalent diesel and can be noisier under load.
Diesel: Pros and Cons
Pros: Better fuel economy (often 10–14 L/100 km for mid-size vans), more torque for hills and load, long-lived engines if maintained. Cons: You must manage RUC — buy before you run out and keep the licence current. Diesel can be pricier per litre in some areas. Cold starts in winter can be harder; glow plugs and good batteries matter. Older diesels may be noisier and produce more visible exhaust.
Petrol: Pros and Cons
Pros: No RUC paperwork; you just fill up. Often cheaper to buy (many older Japanese imports are petrol). Quieter and smoother at idle. Cons: Higher fuel consumption (e.g. 12–16 L/100 km for HiAce-sized vans). Petrol is volatile in price. For long trips or heavy use, diesel plus RUC can work out similar or cheaper per km — do the maths for your usage.
Which to Choose
If you do high kilometres, diesel’s economy and RUC often stack up. If you want simplicity and lower upfront cost, petrol is fine. Check the van’s weight and RUC rate if comparing diesel running costs. Factor in rego, WOF, insurance, and servicing either way.