Some cars need a more durable clutch (XFG,RB4,FXO,XRT,UFR,FZR). I have the impression XFG burns more clutch than the XRG, and there is little difference between them, apart from weight, engine and etc. On the other hand, powershifting a RB4 or a FXO equals to clutch dead literally. UFR and FZR aren't a quick dead clutch, but it suffers, specially the UFR. XRT would be in the middle, not clutch-happy nor a durable clutch either. I get that with mouse its a bit easier to burn clutch, but still, these cars are clutch-happy, and sometimes you need to powershift, which CT makes the difference.