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Awesome. Thank you, getting low on fuel now so I’ll fill up with some premium unleaded at a complete different garage and see!

Pinking, or pre-ignition, is not dependant on engine speed, instead it depends on engine load hence it happens when accelerating. A fuel mixture that is too weak or a spark that is too advanced will cause pinking. Modern engines normally detect that pinking and automatically adjust the ECU output accordingly. That's not to say your engine is definitely pinking because we can not hear the sound, but it is a possibility.