Behold the MX-5, the best-selling roadster in automobile history. Its popularity is due to its eye-catching looks, unwavering dedication to its roots, reasonable fuel consumption and, above all, exceptionally fun ride. The very innovative retractable hard top that burst on to the scene a few years ago only heightened its popularity. The brawn behind the operation in this rear-wheel drive is a four-cylinder engine that ranges from 158 to 167 horsepower, depending on the trim.