Could there be a clear indication of what the "R" Grade rating means? I have heard this could be for a simple bumper change from standard - such as the previous mentioned Stagea with conversion? If stuff like this is the case then I guess realistically there is nothing wrong with the car. But then it comes down to whether or not this can be proven I suppose ... And then is it still able to be registered?
I do agree that the stated odometer is just one thing that is judged. It doesn't take 100,000 kms to smash a car into a pole. However, yes it is something that holds merit over the overall car and should be monitored just as everything else.