My best advice would be to hang on to the Tucson a little longer. The 48,000 miles is really low and the car has a lot of life left in it. Unless it is rusting prematurely, of course.
Leasing is your worst possible option, paying a lot of money for very few miles. Even if you can tax-deduct the leasing costs, it is still the poorest choice.
My retired sister is driving less these days and her best choice is a 4 year old low mileage, reliable compact car which she will likely drive for about 8 years or so.
Anyway, sit down with a pocket calculator and see for yourself how much you are shelling out on leasing vs buying.