nz_fuel_cost_calculator

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Work out the fuel cost of a trip, and of regular driving, in New Zealand. Use this for ANY question about what fuel costs: a road trip, a commute, the running cost of a car, or comparing two vehicles. Common use cases: 'what does it cost to drive Auckland to Wellington', 'how much fuel money do I spend a year commuting', 'is a 6L/100km car worth it over an 9L/100km one', 'petrol cost for 400km'. IMPORTANT about consumption: this takes litres per 100 km, which is how New Zealand quotes fuel economy and what is printed on a vehicle's fuel economy label. A LOWER number is a more efficient car. If a user gives miles per gallon or kilometres per litre, convert it before calling this, or the answer will be confidently wrong. Args: distance_km: Trip distance in kilometres. consumption_l_per_100km: Fuel consumption in litres per 100 km. price_per_litre: Pump price in NZD per litre. Around 2.60 to 3.00 for petrol in 2026; ask the user rather than guessing if it matters. weekly_km: Kilometres driven in a typical week, for the running costs. Leave at 0 for a one-off trip, which returns zero for the weekly, monthly and annual figures rather than an error. Returns: Litres used, trip cost, cost per km, cost per 100 km, and weekly, monthly and annual running costs. cost_per_100km depends only on the vehicle and the pump price, so it is the figure to compare cars with. monthly_cost is a twelfth of the annual figure, not weekly x 4.33. Covers fuel only. Not road user charges, which diesel and electric vehicles pay by the kilometre, and not servicing, tyres, insurance or depreciation.