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It's not the end of the world to not have 93 octane fuel. Half the country doesn't have it. I wouldn't bother with the octane booster. The car runs well enough on 91, you're just down on power a bit. The car has to be safe on 91 since that's the most common premium in the country.
Having driven across the country, I wouldn't worry about gas until you hit 300 miles on a tank. I've squeezed out just over 420 miles from a single tank. I was down to half a gallon of fuel (that Mojave desert... No gas out there...)
For tires, I'd say bring cables. Unless you're planning on living in snow, snow tires would be an excessive purchase.
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