If you can find a more affordable Crown Vic/Grand Marquis in good shape, that would certainly be a good choice. Unless it's a Police Interceptor or equipped with the Handling and Performance Package, it'll have a 2.73 rear axle ratio that's actually pretty impressive in terms of fuel economy on the highway.
These cars are famous for being tough. The biggest thing they have going for them is maintenance; a longitudinally mounted engine with rear wheel drive is pretty straight forward to work on, especially if he's up for doing it himself. Simple jobs are genuinely simple; a water pump can be swapped in 15 minutes; it actually takes longer to flush the system. More involved jobs, like valve cover gaskets, are rare. You also get a lot of car for the money and they are big, heavy cars that offer good protection due to their sheer mass. It also gives them somewhat of a better understanding of driving dynamics, IMHO, since it lacks modern features like ESC, which everyone has come to rely on in a sense; "if I screw up, the "nanny" will correct me". They're not exactly great handling cars, I spent a fortune on mine to make it handle the way I wanted it to, but nevertheless a good means to gain some experience.
That said, by "modern" standards, they are "large" cars which can make them difficult to park for a new driver. I learned to drive in a box Caprice, but things were different back in them days. That said, common sense also comes into play as rear wheel drive opens the door for recklessness, such as donuts in a parking lot. But if he's responsible for its maintenance, that can certainly be a deterring factor.