Two Hatchbacks with some similarities, but otherwise different in most aspects such as the fuel economy, horsepower, ground shadow size, height, and maximum occupancy. First of all, the 2016 Mercedes-Benz B-Class Electric Drive has a more powerful engine than the 2015 BMW i3, and it gets 36.5 fewer miles on a gallon of fuel. Also, although the 2015 i3 is slightly smaller, it has a taller body than the 2016 B-Class Electric Drive. And finally, you'll seat one more passenger in the B-Class Electric Drive than in the i3. Among similarities are the body structure, market segment, and starting price.