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Octane rating is the resistance to combustion.
The 93 is more resistant to combustion than 89. (this is only relevant in the compression stroke.)
The reason this car is suposed to have 93 is because the engine will run a tad hotter than your average econobox.
Just make sure you dont run the engine hard and keep rpm;s low. The cooler you run the engine the less likely you will cause knock.
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