Two Convertibles with some similarities, but otherwise different in most aspects such as the horsepower, fuel economy, ground shadow size, height, and maximum occupancy. First of all, the 2018 Aston Martin DB11 Volante has a more powerful engine and gets 8 mpg less than the 2018 Alfa Romeo 4C Spider. Also, the 2018 4C Spider body is significantly smaller than the 2018 DB11 Volante, and in addition to that, it's also slightly shorter. And finally, you'll seat two more passengers in the DB11 Volante than in the 4C Spider. Among similarities are the body structure and market segment.