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No drawbacks, but on a stock engine, there are no advantages. Higher octane fuel does not burn cleaner, does not burn hotter, does not burn more even..in fact it does nothing differently than regular octane fuel. It is simply a measure of how much pressure it can withstand before it spontaniously ignites. This is why when low octane fuel is put into a high compression engine, you get detonation (pinging and knocking) because the fuel is igniting under pressure in the cylinder, before it is supposed to be ignited by the spark plug (offen when the piston is still in the upstroke, which can blow an engine apart) If you put high octane fuel in an engine designed for 87...absolutly nothing happens...exept you wasting your money.

There are drawbacks of running too high an octane on a engine that doesn't need it. If the timing is not adjusted for the difference in octane you will loose power because of the fact the higher octane burns slower.