The 2012 Seat Mii has become the third vehicle based on the all-new Volkswagen Group city car architecture, following hot on the heels of the recently revealed Volkswagen Up! and Skoda Citigo.

Based on the Group’s new MQB platform, the Seat Mii promises to be almost identical to the Up! and the Citigo, featuring the same powertrains and the same basic interior and exterior design.

The Mii incorporates the Seat family grille and gets its own headlights, front bumper assembly and taillights. The interior also follows the same direction as its city car siblings, with an uncluttered dashboard and centre console layout. The budget-conscious Seat features simpler and cheaper materials than the Volkswagen however, trading body-coloured metal and leather upholstery for plastic and basic cloth seats.

Despite this, the Mii will still incorporate the advanced technology showcased in the Up!, including City Safety Assist (autonomous braking to avoid crashes at speeds up to 30km/h) and the Seat Portable System, which brings together vehicle information, navigation, entertainment and phone functions.

The Mii will go on sale in Spain before the end of the year in three-door form before being joined by the five-door later in 2012. The Seat Mii will not be sold in Australia.

The Volkswagen Up! has been confirmed for an Australia launch in the fourth quarter of next year, while Skoda Australia is investigating the Citigo for our market. Both vehicles should be to be priced below $15,000.

Which design do you like the most? Up!, Citigo or Mii? Let us know in the comments section below.