My gf has a 1998 TJ and I know how bad that fuel mileage can be! The WRX is obviously going to be much better in relation, but do take into account the need for premium fuel. And if you're going to start hunting down V8's with mods pushing the power up - the fuel economy can really tank. At that point, you'd be better off with one of those American V8's. The new Mustang GT is an amazing drive and has a ton of power and actually gets better mileage than my car.