Mostly can only estimate the usage from the wear & tear of the interior. If genuine 23k used only, then it's practically like new, the seats/shift know and other switches will still practically new and all still works like new. If the leather on the shift knob & seats are already a bit shinny or cracking or already got electrical problems like power window not working, then it's definitely used a lot more.
Then you should observe if all the labels/markings especially those in the engine compartment are still very obvious like new. If those markings are already fading then the car has been used a lot more then the indicated odometer.
As for the tires, for such performance car sometimes the tires will not last like normal cars if the owners drove them hard often, so it's possible that the tires had been changed.