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93 octane (premium)
Premium is recommended, but it is only recommended. You can use 87 octane gas and it won't harm your car. The computer will adjust the timing to prevent knocking. Your fuel economy will drop a little (but you will still end up spending less on fuel, because it will be very minute, almost unrecognizable), and your performance will hurt a little. If the manual said premium required, then I would suggest using premium, because the engine can't adjust itself enough to prevent premature detonation (knocking).
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