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Hi Darth - As the 172 has a higher performance engine than the average car it will probably perform that bit better with the slightly higher octane petrol. Whilst using the 95 RON will probably do no harm using a fuel better matched to the engine may also improve its efficiency and therefore more MPG. Although slightly more expensive it may well be cheaper in the long run. I suggest you try a few fill-ups and see what happens.
Currently in madnoel10's garage:
Honda Civic 1.4l