Spending more money on a Rio initially buys you a pair of rear doors. The Rio S five-door has the same features and equipment as the least costly model, the Rio S three-door, and costs about $1000 more.
Spending more again for the S Premium gets you cruise control, adjusted from buttons on the steering wheel. Wheels are the same 15-inch size but of a more attractive design in lightweight aluminium alloy (including the spare wheel). There is a premium steering wheel, which is nicer to hold, and front foglights.
Stepping further to the Rio Si gets you the more powerful, 1.6-litre direct-injection engine, as well as 16-inch aluminium alloy wheels with slightly wider and lower-profile tyres, and a more appealing interior with soft-touch dashboard and door trims.
The two remaining Rios, the Rio Sport and the Rio SLi, offer you alternative ways to dress up the 1.6 litre engine.
The Sport, as its name suggests, takes the sportier route, and has only three doors. It gets you another step up in wheel size, to 17 inches, and has fake-leather seats, and bare-metal control pedals. Headlamps switch on automatically when it gets dark. There are long-lasting LED daytime running lamps. And there are static cornering lamps on each side at the front: as you turn the steering wheel to enter a corner at night, these light up and illuminate your path.
The Rio SLi is a better equipped version of the five-door Rio Si. Like the Sport, it has the bigger wheels, auto headlamps, LED running lamps and cornering lamps. However, its seats are cloth but with leather accents. It also has rear parking sensors, which indicate how close you are to objects behind when reversing, and windscreen wipers that operate automatically when it rains. And its air-conditioning has climate control, which maintains a set temperature.