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Hearing a volume difference between gas brands is likely in your head. I run shell or petro 91 on a 91 tune in the winter and petro 94 on a 93 tune in the summer and there's no difference in volume.
As for the power difference, it is noticeable above 5000rpm between a 91 and 93 tune, but isn't going to be massive.
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Light travels faster than sound, so people may appear to be bright until you hear them speak...
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