Id be interested in your measurements smarty156. Ive completed 20,000km in my car (no track work but a fair few back road fast drives). I certainly have a lip forming on the front rotors and I would say my pads are at around 50% from visual inspection although Im unsure if there is additional tapering I am not seeing from a cursory inspection. Ive just completed my second service and did ask them to note the measurements but they did not supply them on the invoice so will chase that up. From what Im seeing my guess is the fronts will be good for 40,000km (25,000 miles). My third year service will likely be at around 35,000km but Id look to probably replace the fronts at that time as I advocate always leaving at least 3-4mm of material on the backing plate as not to put too much heat through the system (and also to account for any tapering). Not sure if the front rotors will need replacing at that time but i suspect they will be within a year of needing to be replaced - will likely leave them till the 4th year service to spread the costs. My rear rotors are looking good, my guess is they have won at half the rate of the fronts. The rear pads look meatier than the fronts but not by as much as I would have guessed so I image teh rear pads will need repacing in the 4th year too. man that fourth year service is going to break teh bank (probably will come in at around 5%+ of the then value of the car!!).