Fuel efficient cars

I have a car payment. That much is obvious from my debt r0undups. So, I can't trade in my car for a more fuel efficient one. I have a fairly fuel efficient car already. But it would sure be nice to have the gas saving Prius. Of course, I guess I should be thankful that I got this car instead of the sporty car I was looking at. It would have not been as fuel efficient. And I suspect I would have been up a bit of a creek now.