You have the choice of two 1.0-litre three-cylinder petrol engines – one with 59bhp and the other with 74bhp. Neither is particularly energetic and both need plenty of revs to get going.
However, the lower-powered version feels sluggish out on the open road, whereas the more eager 74bhp model copes with fast A-road and motorways well enough.
The less powerful engine is available in economy-boosting Ecomotive form, which gets engine stop-start among other fuel-saving measures. There’s a price premium, but no penalty in performance.
You can have an automatic gearbox with the higher-powered version, but while it looks hardly any slower than the manual version on paper, the gearchanges are sluggish, so it’s best avoided unless you must have a two-pedal car.
Seat Mii ride comfort
One of the Mii’s main virtues is its supple ride. For such a small car, it does a good job of staying controlled over speed bumps at low speeds, and deals well with the sort of broken surfaces and potholes you’re likely to find on your local high street.
The ride remains comfortable at higher speeds on A-roads and motorways, where the Seat feels remarkably composed for such a small car.
Seat Mii handling
The Mii handles brilliantly by city car standards. In fact, plenty of £20k hatchbacks could learn a thing or two from the Seat’s precise, well-weighted steering and its tidy body control that stops the car swaying about too much through twists and turns. There’s a decent amount of grip, too.
Importantly, the Mii also feels light and is effortless to drive around town and easy to slot into tight parking spaces.
It’s also incredibly planted at high speeds for such a small car, and remains stable in crosswinds.
Seat Mii refinement
Three-cylinder engines are normally buzzy things, but not the Seat’s. Of course, it isn’t quite as smooth as most four-cylinder engines, but it stays remarkably hushed by city car standards in all types of driving.
A bit of road noise creeps into the cabin at higher speeds, but there’s far less road noise than in most rivals.
The Mii’s manual gearchange is light and precise, and its clutch and brake pedals have plenty of feel, making them easy to modulate. The optional automatic gearbox is jerky and slow to respond.
The lower-powered of the two 1.0-litre petrol engines is fine in town and crucially helps keep the price low. It also uses slightly less fuel than the higher-powered unit, plus it’s available in even more economical Ecomotive guise. It can feel underpowered on faster roads, however.
The more eager 74bhp engine copes impressively well at motorway speeds and around town; it’s the one we’d recommend if you regularly venture out of the city limits. Unlike the lower-powered unit, it can be combined with an automatic gearbox.