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How are petrol prices determined?
The price of petrol is determined by several factors. These include competitive activity, the cost of refined petrol and diesel on the world market, the cost of shipping, the exchange rate between NZ$ and the US$ and Government taxes. The cost of crude oil also has a large impact in driving prices over time.

Independent Challenge retailers determine their own retail prices at the pump. All companies are purchasing oil in the same market, so all are under similar margin pressure when prices are increasing. Oil companies are working off very slim margins in New Zealand.
What is the octane rating?
Octane is a measure of a gasoline's ability to resist pre-ignition, commonly known as 'knock'. Comparing performance in a test engine against iso-octane and n-heptane identifies an octane number. Iso-octane is good at controlling knock and is given a scale value of 100. N-heptane is very poor at controlling knock and is rated zero.

Octane requirements for a car are generally determined by the design of the car and the driving history it has. As a car is used more, the condition of the engine changes and this can cause a need for a higher octane. Many car manufactures design car engines so that even when the engine changes, the car will still run fine on 'regular' octane. However, some cars with high compression engines, like sports cars or luxury cars may need a higher octane. This is usually due to the more serve designs of the engines or because deposits that built up during the running of the car are greater than expected.
What legislative controls are imposed on the operation of your business?
The petroleum wholesaling and retailing market was deregulated in 1998, so there are no specific price regulations in place. There are requirements such as safety, environmental, health and product specifications all of which Challenge adequately meet in New Zealand.