Most cars aren't good investments -- the only return you'll earn from owning one is a way to get around.High-end cars may depreciate less, but buying a vehicle with the lowest possible sticker ...

Most Expensive 3-Year-Old Cars per 1,000 Miles Driven. 1. Porsche 911: $60,708. 2. Mercedes-Benz SL-Class: $59,788. 3. Porsche 911 Convertible: $56,388 ...