Although there are some similarities, these two are different in most aspects such as body structure, fuel economy, model year, market segment, and ground shadow size. First of all, a major difference is in the body structure and in the size of the vehicles. The 2016 Regal is a Sedan and is slightly larger than the 2014 Leaf, which is a Hatchback. Also, the Regal gets 89.8 more miles on a gallon than the Leaf. Among similarities are the starting price and maximum occupancy.