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Originally Posted by andyhs
As I know, the octane number only indicate how fast the gas will burned.
While there are another factor about the quality of the gas, energy. How much the energy is released when the fuel is burned.
Using higher octane number than the engine's need is wasting money, but higher energy could do something, but the air/gas ratio must be re-adjust.
Also, the fuel should contain some kind of lubricants (if needed by the engine) for lubricating the exhaust valve.
Andy
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Octane is gasolines resistance to combustion. The higher the octane number the higher the the resistance. The air/fuel mixture in some engines can be ignited prematurely by number of factors. Overheating, advanced timing, high compression, hot carbon contaminates....etc. In a normally functioning engine, the only reason for higher octane fuel is for engines with higher compression. Higher octane fuel only provides a power boost over lower octane fuel when the lower octane fuel is pre-igniting. The "energy" in gasoline is the same over all grades and brands. The lubricant in gasoline (lead) has long been eliminated with the advancement of hardened valve seats.