The gasoline octane is not related to the increased power of the engine but is a unit measurement of the power antiknock of the gasoline in question.
There is a widespread belief that higher octane gas is able to deliver higher performance, more power, and less abuse to the vehicle engine. This is completely false.
In contrast to what many drivers believe that it is true, the level of octane in gasoline does not indicate the purity or quality, nor the force that fuel can deliver. Actually, the octane rating is the unit of measurement to indicate the level of the antiknock power of fuel, in other words, the higher the octane rating, the less explosive it will be the gasoline.
This gradation in octanes is used to identify the different levels of anti-knocking of the fuel, thus being able to select the appropriate level of compression that the engine pistons of our vehicle are capable of reaching.
Thus, if a high-compression engine is fed with low-octane gasoline, the mixture will ignite spontaneously due to the heat generated in the compression itself and before the piston reaches the upper dead point of its travel, or rather, it will explode before the piston has reached its highest level of compression and before the exact moment of the spark plug ignition. The result will be an inefficient ignition of the engine, higher fuel consumption, loss of power, and the odious "tinkling".
When you feed a low-compression engine with high-octane gasoline, what you will get is incomplete combustion due to a deficit of the temperature reached by the mixture during the compression stage, so that, in the end, the engine will be eliminating gasified gasoline and uncombusted, along with exhaust gases.
A bit of general automotive knowledge is not bad for this spring Friday
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glad to know this, I have to admit that I am one of those who thought that the greater octane rating in gasoline mean a better quality 
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