[Superman]

Some time when you're going up a slight incline at highway speeds, in fourth or fifth gear, keep your right foot on the throttle and just tap the clutch pedal. Enough that it releases, and then lift your foot off and pay attention to how quickly the tach returns to your previous 'cruise rpm.' If it does not return quickly, your disk is getting thin. If there are 98K miles on your clutch, then I'll save you some time. Your disk is getting thin.