what do i lose in "selling" my financed car?

Just driving your car off the lot, it has depreciated. And in order to sell the vehicle you will need a clear title, so you would have to pay it off before you can sell it. So, you will be losing quite a bit if you go to sell it because you are moving far away. Unless "far away" means overseas! But you said "the cost of driving it", so it doesn't sound as if you are going that far.

You are much better off keeping it, driving it wherever and making the payments.

You'll lose thousands of dollars if you try to sell a car after only three payments. The depreciation is huge.

If you'll need a car in the place you are going, take it with you. It's way cheaper than selling and buying another car.