affordable convertibles

It's springtime, which means tornadoes for some of us, showers and muggy weather for others. It also means putting the roof down on convertibles after the long winter hiatus. Which led us to wonder: What's the best gas mileage you can get in a new drop-top car with four seats (or at least four seat-like spaces, no matter how small)? The answer, newly unveiled at last week's New York Auto Show, is the 2012 Fiat 500 Cabriolet (or "500C" as it's also known). It goes on sale this spring, presumably meaning by June. Though ratings aren't yet out for all 2012 models, the EPA rated the 2012 Fiat 500...