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Probably the easiest way to save some money is to use regular gas. If your car has a knock sensor it should prevent knocking. If you do get knocking then drive with low throttle until you refill with premium. Maybe you can do something to reduce the maximum turbo boost pressure so it won't need to retard the ignition timing when you push hard on the gas pedal. Another possibility is to add a water injection system to improve operation with low octane gas.
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