According to this article:
http://www.usatoday.com/money/autos/...1-accord_x.htm
Quote:
The Accord V-6 ratings assume regular-grade fuel, and Honda will market it as a regular-fuel engine. But — pssst — it's good for another 10 hp and 10-plus lbs.-ft. on premium, acknowledges V-6 engineer Asaki.
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Presumably this is true for the HAH as well, so does this mean that the car is good for 263 hp on premium.
I'm just itching to try it and see if it makes any difference, although I know it's not very "green."