There are two 1.0-litre petrol engines available with 59bhp or 74bhp along with a green Ecomotive version that has CO2 emissions of 99g/km resulting in no road tax, exemption from the London Congestion Charge, and low fuel costs.
That's not to say that the rest of the range will cost significantly more to run. The 74bhp engine, when mated to the standard five-speed manual gearbox, emits just 108g/km of CO2 and has claimed economy of 60.1mpg.
What's the 2012 Seat Mii like to drive?
Just like the Skoda and the Volkswagen, the Seat Mii rides the bumps and potholes in the city very well. Even the slightly firmer Sport model copes well enough, although you're more likely to hear a clunk when going over poor surfaces than the other versions.
The Seat Mii is great to drive around town
There's little body roll with either suspension set-up, and the Mii feels as composed as much larger cars. The steering is well weighted, so you feel confident making direction changes at any speeds.
Both engines are fine in town. There's more than enough power for swift exits at busy junctions, and both variants are quiet at 30mph. The Ecomotive's stop-start system reacts quickly, too, but sends a wobble through the car when it kicks in.
If you spend most of your time in town, go for the 59bhp version. It can reach 70mph, but struggles to build up speed once it hits 50mph. The 74bhp unit takes a while to hit motorway speeds, but does it quicker and is quieter once it gets there.
Refinement is generally good, with wind noise being the biggest issue at speed.
What's the 2012 Seat Mii like inside?
For a car with such tiny dimensions, there's plenty of room for four adults in the cabin there's even enough rear headroom for anyone more than six-foot tall, although legroom might be a problem if front passengers are equally lofty.
The 238-litre boot is decent, too it's larger than the Kia Picanto's. However, there is a drop from the boot lip to the floor, and there's a large step when the rear seats are folded down flat.
The cabin doesn't look or feel as nice as the VW Up's but, with price differences ranging from 150 to 918 per equivalent model, that's not a big surprise. Higher trims get gloss metallic-look plastic on the top face of the dashboard, which looks better than the light beige trim in other cars.
Avoid the entry-level S trim if you can. Although it comes with four airbags and MP3 connection, it doesn't get much else. Fork out a bit extra for the Ecomotive and you get air-con, electric windows, remote central locking and stability control as standard, and you get a wider set of options to choose from.
The excellent portable sat-nav system is available as a 275 option on all versions of the Mii, rather than just higher-specced cars, like in the Citigo and the Up.
Should I buy one?
Yes. It's hard to argue against the Mii when it drives as well as the Citigo and Up, so all you really have to decide is which one you like the look of the most.
However, one thing that holds back the Mii is equipment. The top-level versions are generally as well specced as the equivalent Citigos and Ups, but basic models are poorly equipped.
What Car? says