If you think the Chevrolet Sonic sedan looks a bit abbreviated now, you should have seen it before General Motors stretched the vehicle. Take a good look at the spec sheets for the Sonic hatch and Sonic sedan, and you'll likely notice the four-door is over a foot longer than its twin. According to Automotive News, GM felt that early design attempts at the sedan bodystyle were too stubby looking. While the four-door was always intended to be somewhat longer than the hatch, designers rolled in additional space in the vehicle's rump to help situate the vehicle's proportions.
All told, the Sonic sedan is a whopping 14.1 inches longer than the Sonic hatchback, and nearly all of that length is in the trunk area. That gives the Sonic Sedan 14 cubic-feet of cargo area, just 1.4 cubes less than the significantly larger Chevrolet Cruze.