Use whatever octane the owners manual specifies. Octane is very misunderstood with the public. The lower the octane, the faster, and more uncontrollably, the gas will burn. It is easier to produce, which is why it is cheaper at the pump. It is NOT of a lower quality. More expensive vehicles tend to require "premium" gas because they run higher compression, which will in turn create more power and torque. An engine with higher compression needs higher octane so it will not predetonate, which can destroy the engine. A higher octane means the fuel will burn more slowly and predictably. It will NOT create more power.
So basically, unless you are increasing the compression of your engine or increasing the boost on the supercharger, do not run higher octane than recommended in your owners manual. Higher octane will produce LESS power. By the same token, octane boost additives that you can find on store shelves will not increase power or mileage. They will hurt it. The only way they can increase mileage is if they incorporate an injector cleaner. By the way, running injector cleaner every oil change is the best way to keep your vehicle running smoothly and efficiently.
Hope this helps, let me know if you need further clarification.
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