Two Convertibles with some similarities, but otherwise different in most aspects such as the modifications, fuel economy, model year, and horsepower. First of all, there is a difference in model years. The is 2 years newer. Also, although the 2018 DB11 Volante has a more powerful engine than the 2016 GranTurismo Convertible MC Centennial, it gets 5 more mpg. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.