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I ran regular 95ron at 1st in mine, then I decided to run Shell Optimax, it's made a difference, car runs better and feels slightly nippier as well. Renault do recommend using at least 98ron.
Hi, was on the twingo oc forum and there was a thread about it. It doesn't seems to do anything apart maybe keeping you engine cleaner. It would only make a difference on an engine tuned to it.