If you can afford to, buying at 3 years old and selling at 5 I've found to be the most economical way - if you are intent on changing the car regularly that is, if not buy at about 5 years old and keep until it falls apart.
If you can afford to, buying at 3 years old and selling at 5 I've found to be the most economical way - if you are intent on changing the car regularly that is, if not buy at about 5 years old and keep until it falls apart.