Just to expand on that a little more:
Increasing the octane level of the fuel by itself will do NOTHING in terms of performance (on a carburetted OR fuel injected vehicle) and in many cases will actually cause a LOSS of performance if no other steps are taken to take advantage of the anti-knock properties of higher-octane fuel.
Octane has NOTHING to do with the quality of the fuel or the power-producing qualities of the fuel. It burns slower....THAT'S IT.
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