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A knock sensor will adjust to a point but it is not a good idea to run it on anything lower than the recommended octane.
You will see an increase in carbon build up and in turn increased wear, lower power and often lowered fuel mileage.
In the end, if fuelling the car you are driving is to expensive for you then it is time to think of another vehicle.
Almost all vehicles these days CAN run on regular fuel, but you will pay for it in some other way.
With sports cars you pay to play.
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