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The DI v6 runs off 87 but in my caddy it says use 91 for the most performance....which means it has probably 2 fuel maps....just like every other performance car. Difference being the v6 was designed for 87 and they probably just tweaked it a bit for 91 as opposed to the SS which was designed for 91 but also has a low octane map.
I dont know why people think higher octane is a better/cleaner gas. It just adds more anti-knock additives such as toulene.
Its not better gas. Adding certain amounts of toulene to 87 octane is (pretty much) the same thing as buying 91.
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