Two Convertibles with some similarities, but otherwise different in most aspects such as the fuel economy, model year, starting price, horsepower, ground shadow size, and height. First of all, the 2014 Porsche 911 Convertible is priced $23,500 lower compared to the base MSRP of the 2016 BMW M6 Convertible, which is newer by two model years. Also, the 2016 M6 Convertible has a more powerful engine and gets 5 mpg less than the 2014 911 Convertible. And finally, the M6 Convertible is both slightly larger and taller than the 911 Convertible. Among similarities are the body structure, market segment, and maximum occupancy.