Does Honda Civic Si require Premium Gas?

Does Civic Si require Premium gas (93+ octane) or is regular gas enough (87 octane?)

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What YEAR?
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TeGGeR

The Unofficial Honda/Acura FAQ
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regular is enough if its a new one honda recommends 93 for better performance

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The "Owner Link" at http://automobiles.honda.com/ says that, for the 2005 Civic Si, regular unleaded is "required." (Of course they mean that a minimum octane of 86 is needed.) But for the 2006 Civic Si, it says premium unleaded is "required."
Go to the site above for earlier Civic Sis.
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