Is super/ultimate unleaded petrol really worth it?
If you car does not require super unleaded, then there is no advantage in using it. Super unleaded actually retards combustion that may occur in a region simply due to high temperature. In order to get the most out of the gasoline, you want the flame front to travel in one distinct direction, away from where you’ve ignited the spark (at the spark plug). In most engines, this is not an issue. However in racing engines where you get high compression. Gasoline can begin to ignite simply due to the heat and high compression. This may cause other flame fronts (spontaneous combustion) to develop that may even hinder the flame front leaving the spark plug. This usually results in a reduction of power, and is associated with knocking of the engine as the flame fronts collide. If you do not hear knocking noises coming from your engine, your engine is not at a high enough compression to where it develops, then you will gain nothing by using super unleaded. However if you hear engine knock, liter
