Although there are some similarities, these two are different in most aspects such as body structure, fuel economy, market segment, and ground shadow size. First of all, body structures are completely different. One is a Hatchback and the other a Wagon. The 2016 Chevrolet Volt is also slightly larger than the 2015 Kia Soul EV. Also, the 2016 Volt is more fuel efficient; it gets 63 more mpg than the 2015 Soul EV. Among similarities are the starting price and maximum occupancy.