I never look at a car as an investment, I don't live in my car. It is more like negative equity, and just a means of transportation. The bottom line is, no car is worth what we pay for them. And unless you keep your car for 10 plus years, the trade in value will mean nothing, since you keep yourself in that constant cycle of car payments, and giving the Banks a ton of money in interest.
Let no debt remain outstanding, except the continuing debt to love one another, for he who loves his fellowman has fulfilled the law. Romans 13:8