It's a good question. Basically, it's a "high octane" tune. The changes between 91 and 93 octane are minimal, so in most cases, 91 or 93 octane can be used. If there are any driveability issues caused by the fuel, the timing can always be adjusted to compensate.
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Blessings, Corey 
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"What good is it for a man to gain the whole world, yet forfeit his soul?" - Mark 8:36
 "Lemming suicide is a frequently-used metaphor in reference to people who go along unquestioningly with popular opinion, with potentially dangerous or fatal consequences."
Quote:
Originally Posted by JackandJanet
Looks to me like some people want to go through life with blinders on - "Don't confuse me with facts, my mind's made up!".
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 Our son arrived home safely from Iraq; many others won't. You don't have to support the war to support our soldiers.
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