Firstly, the car doesn't need higher octane fuels, so you're wasting your money there, and secondly, if the engine doesn't have a high enough compression ratio to warrant the use of high octane fuels, you'll be reducing your gas mileage due to losses in efficiency. If you're concerned about the temperature of your motor, make sure your engine is tuned properly and your cooling system is in good shape. Another thing, gas companies try to sway you to use their gas by advertising their additives in their fuel. This is malarkey pure and simple. All fuels have detergents, so go to your nearest and cheapest gas stations to fill up.
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