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If it says 97 on the cap - then yes, absolutely essential.
The car will have been mapped with more ignition advance, running lower RON fuel will likely cause pinging/knock/detonation which kills engines or at the very least the ECU will detect knock and scale back the ignition timing, resulting in less performance and poorer mpg.
danb
NurseHolliday
High octane fuel: Woth it, or waste of money?
Car says 97 or higher on the filler cap.
Asked on FB, but mostly got LOLZ dickswinging jokes in reply, so deleted it!