Wizjp is right. You have not given enough info on what you are trying to do. Are you trying to lower your payments? Buy a car that gets better gas mileage? Usually if you drive the normal mileage per month, you will get at best a trade in maybe 1,000 less then you owe.
So if you owe 14,200, I would guess at best your trade in would be 12,500. But wait, this does not include taxes, registering the new car, and all the new documentation fees. Buying a new or newer used car, will cost around $300-$500 buying a new car you have to pay taxes. At an average 8% is $80 per $1,000. What this means is to break even for monthly payments would be the same, you are at a loss of $2,000+ taxes. around $900. So to break even you would need to find a car around $11,000. If you are trying to lower your payments, get better gas mileage, you will have to buy a car for less $11,000. As I said what are you trying to do? The basic rule of thumb is if you buy a car unless you work for a company that gives a car allowance, or you are wealthy you should keep the car for at least 5yrs. Otherwise you are wasting money. If you have the money to waste go ahead. Must of us do not. The only reason to exchange the car is to lower the payments because you can not afford the car you have. Like say you bought a $30,000 car, when you were making $60,000 a year. Then lost the job, and now making $30,000. If you could turn the car in, for lets say a $15,000. car. Where you can lower your payment to almost half. That would be smart.