i have often wondered about this when buying a new car or a when with a friend buying a new car- how many miles should the "new" car have on it...at what point do you say this is too many miles, i dont want this car? especially with sports car, where people tend to drive hard during test drives, this could be an issue...20-50miles is ok...but what about 100? 200? in a camary, this would not be an issue...but what about every day sports cars like vettes, porsches, s2000s,vipers, m3, z4, etc? your thoughts..