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Higher octane (91 and up) gas burns more slowly and will actually give poorer performance when fed to engines that were designed to burn anything less than premium fuel. Running premium fuel in an engine that requires regular or mid grade will not give you more power or better mileage, but actually the opposite.

So why spend more for a fuel that will potentially make your engine run at less than it's best?

There is one thing, though, that could cause you to use a higher grade gas: age. As an engine gets older, carbon buildup on the tops of the pistons effectively increases the compression ratio, which in turn means you may find that the engine knocks when you use mid grade gas.

Living in Florida I have used Regular, and mid grade gas without a problem.

Tom