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Despite being a little wary of supposed performance increases from higher ron fuels I thought I would give Optimax ago. I saw a TV programme that reported a 20bhp gain in an Impreza using 98 ron compared to 95 ron. Now it may be a case of mind over matter but I'm sure my Boxster S has more go, particularly a little lower down the rev range. I'd be interested to hear other owners opinions.