That is one tough call to make. My husband has a Buick Century that he drives for his everyday car, it gets around 30 mpg in town. But and I mean a big BUT it has 250,000 miles on it, all the lights that tell you something is wrong is on. I told him if they go off he has to start worrying. He has another newer car but very seldom drives it as he doesn't get the mileage as the old car. He has to decide on getting rid of it or wait until it dies on him. Then he would have to have it hauled to the junk yard or he can get rid of it now and make a little money on it.
Pat in MN