Q: Ran car on wrong octane fuel

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Hi, i am running a ford focus st with around 290-300bhp, it has been ran on shell v power, i stupidly filled up with normal unleaded, i ran the car lightly and drained the tank and is now back running on shell, however even though it has improved it is still misfiring at high revs ( pre detonating i think ) my question is does the ecu take a while to re learn the higher octane fuel?

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