It would be possible to fit runflat tyres to this car on the basis that the dealer has confirmed the wheels are suitable. As a general rule, runflat tyres produce a harder ride compared to conventional tyres as their additional strength is partly due to stiffer sidewalls. This can affect how the car handles, as the sidewall deflects during hard cornering and this is transmitted through to the steering wheel and gives the driver feedback on how much the front tyres are gripping the road. Ultimately the amount of grip on offer would be almost identical given the same dimensions and tread pattern between a conventional and a runflat tyre, so it is a matter of how important the feedback and ride comfort is against the reassurance that runflats offer.