In raw numbers, the Rio has a 101.2-inch wheelbase, an overall length of about 160 inches, and a cargo area of 15 cubic feet (or 13.7 cubic feet, for trunked sedan models). It's significantly larger than the outgoing model.
The Rio sizes up against its subcompact competitors by taking the middle of the road. Cars like the Hyundai Accent and Honda Fit have more space inside, as does the Nissan Versa hatchback, while the Rio, at 88 cubic feet of interior room, shaves a few cubic feet to stack up against the likes of the Ford Fiesta.
The Rio's back seat is more confined than in the Fit, with no adult-sized knee or head room to spare; its Accent cousin does a better job of providing space for four. It's the same story in luggage room, too, where the Rio's nicely squared-off cargo hold nonetheless leaves the right kind of space for roll-on bags and Costco boxes.