SEAT has unveiled its new Mii city car, which it will begin selling in its home market, Spain, before the year is out, with the rest of Europe to follow in spring 2012.

The 3.55 metre long Mii will first be introduced as a three-door, with the five-door version arriving next year. Drivetrain is a 1.0 litre three-cylinder MPI unit, with two output tunes available for the Ecomotive – 60 PS and 75 PS.

If it’s all starting to sound like you’ve seen those numbers before, well, you have, because the Mii is the SEAT version of the Volkswagen Up!, and together with the recently announced Skoda Citigo, form a trinity of hatchbacks utilising the same base platform.

Like its relatives, the Mii has 251 litres of boot space, increasing to 951 litres with the rear seats folded. Other numbers include a 35 litre capacity fuel tank and an 854 kg base weight. Aside from a five-speed manual transmission, the Mii is available with an automated manual box boasting two electric motors to offer smoother gear changes.

Features include a start/stop system, brake energy regeneration, City Safety Assist and a removable SEAT Portable System with a five-inch screen, navigation system and hands-free phone system with voice control.

In Spain, the Mii will be available in three equipment lines – the base version as well as Reference and Style, the latter offering features such as power windows and central locking. Chic and Sport packs add alloy wheels and leather steering to the equation, and for the Sport tinted windows and a sports suspension