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If your car is fitter with knock sensors and can self learn ignition timing up to the knock limit, then it'll be a small improvement as ignition will be advanced to make use of the higher octane.
If there are no knock sensors then it'll make no difference..... unless you can manually advance the ignition?
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1997 Citroen AX 1.1i SPI
2003 Ford Focus 1.8 Tdci estate
Ecomods: See my garage
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