2021 Seat Mii — Full Specifications
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The 2021 Seat Mii belongs to the Mii generation, built 2011–2021. 2021 was the final year of this generation, so it is the most developed version of the design. Body styles: 3-door hatchback, 5-door hatchback. The engine range listed for this period includes 1.0 MPI 60-75, 1.0 CNG 68. Owners often keep a Seat Mii workshop manual to hand for servicing and repairs.
Mii Generation: Engines & Body Styles
Seat Mii model years from 2011 to 2021 belong to the same generation. The engines below are those listed for this generation in the 2021 period; availability varied by year, trim and market, so confirm the exact engine from the car's paperwork or the badge on the tailgate.
| Engine | Fuel | Displacement | Power |
|---|---|---|---|
| 1.0 MPI 60-75 | Petrol | 0.999 L | 60–75 PS |
| 1.0 CNG 68 | Petrol | 0.999 L | 68 PS |
| Body styles | 3-door hatchback · 5-door hatchback |
|---|---|
| Transmissions | 5-speed manual · 5-speed automatic (optional on some models) · 1-speed (electric) |
| Generation | Mii (2011-2021) |
Generation, production years, engines and body styles compiled from Wikipedia; production dates can differ by market. Official fuel economy and CO₂ figures for UK cars are published by the Vehicle Certification Agency and vary by engine and test cycle (NEDC or WLTP), so we do not quote a single figure here.
Owner Essentials for the 2021 Seat Mii
Running Costs: 2021 Seat Mii
Running costs for a 2021 Seat Mii depend mostly on which engine it has, how it is driven and the insurance group of that trim. Look up the exact car's tax band and fuel figures from its registration on GOV.UK, and work out fuel spend with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Only need this car occasionally? See our buy vs rent comparison.
2021 Seat Mii Safety Rating
Cars sold in the UK and Europe are crash-tested by Euro NCAP, not the US NHTSA, so there is no NHTSA star rating for the Seat Mii. Look the Seat Mii up on Euro NCAP's results page to see the star rating and the test year for this generation; ratings from different years use different criteria and are not directly comparable. To check a specific UK car for open recalls, use the GOV.UK vehicle recalls checker, and see our UK guide to checking a used car's history.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 2026
Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.
Recommended Accessories for the 2021 Seat Mii
Frequently Asked Questions
Which generation is the 2021 Seat Mii?
The 2021 Seat Mii is part of the Mii (2011-2021) generation, produced 2011–2021.
What engines did the 2021 Seat Mii come with?
Engines listed for this generation include 1.0 MPI 60-75 (petrol); 1.0 CNG 68 (petrol). Not every engine was sold in every year or market, so check the car's V5C or handbook for the exact unit.
What body styles does the 2021 Seat Mii come in?
This generation was offered as: 3-door hatchback, 5-door hatchback.
What gearbox does the 2021 Seat Mii have?
Transmissions listed for this generation include 5-speed manual, 5-speed automatic (optional on some models), 1-speed (electric), depending on engine and trim.
How safe is the 2021 Seat Mii?
European-market cars are crash-tested by Euro NCAP rather than NHTSA. Search for the Seat Mii at euroncap.com/en/results to see the star rating and the test year for this generation.