What would be considered "high miles" for these cars? I bought a mustang with 120k and put 200 shot of nitrious on it and now I have a supercharger on it and it still has the same short block with 137k miles, and it still runs great. If I was to buy a car with 100k (I know that all cars if taken care of will last forever, but) would it be considered "high miles?" And what would you guys consider to be a high milage car.