Hello scotty!!! Thanks for what u do, i have a 07 european mk2 ford focus with a 1.6 ltr and 10:1…

Hello scotty!!! Thanks for what u do, i have a 07 european mk2 ford focus with a 1.6 ltr and 10:1 compresion ratio duratec engine, fuel cap says min 95 octane, being a fuel injected and ecu controlled engine with those timing advnce/retard stuff can i switch to 91 octane safely or it will damage my engine in the long run? I drive 80 kms daily, never reving it up to 4000 rpms...thanks...

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