Australian high octane fuels are higher density resulting in improved fuel economy and have added detergents that keep engine parts clean, providing smoother engine performance and lower fuel consumption.

A sophisticated knock sensor (currently found on some high-performance and luxury models) actively tunes your engine (for example, spark plug timing) to the maximum possible setting before it starts to sense knock. It can therefore take advantage of the higher octane rating, and actually increase the power output of your car.

So its not just the RON rating alone in premium fuels that make a difference.