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Lower octane actually makes more power technically. An engine designed to run 87 octane will lose power running 93, but an engine designed to run 93 (with modern computers), will lose power running 87 due to the DME adjusting the fuel and timing to prevent the motor from blowing up (which could still happen). Higher octane burns slower, which makes less power, BUT an engine designed to run high octane are high compression motors with more advanced timing (or turbos) so the trade off trumps the amount of power lost by the amount of power gained. Kind of like a supercharger, it takes power to run it, but it more than makes up for it.
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