SEAT Mii (2012)

Estimated running costs and MOT pass rates from 2,875 MOT tests in 2024.

Annual Cost

£1,600

£133/month

MOT Pass Rate

81%

Good

Road Tax

£20

Estimated/year

Est. Insurance

Grp 1-8

999cc Petrol

Solid Option

81% pass rate, £1,600/year to run. Close to the average across all models.

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Petrol999cc14 years old2,875 tests71k miles avg

Annual Running Costs

Fuel (Petrol, 999cc)

~50 mpg

£1,175

Road Tax

Estimated CO2 band

£20

MOT Test

£55

Predicted Repairs

£350

Total per year£1,600

Per month£133/mo

Per week£31/wk

Estimates based on 7,400 miles/year (UK average), petrol at 174.57p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included.

Reliability Verdict

81% MOT pass rate(Good)

0%All-model avg: 82%100%

Good reliability. Occasional issues but generally solid. That's close to the average of 82% across all models in our data. It falls below the SEAT brand average of 85%.

81% of MOT tests on SEAT Miis from 2012 ended in a pass in 2024, when they were about 12 years old. That's based on 2,875 tests across the UK, retests included. The average mileage recorded at those tests was 70,829 miles.

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How Does It Compare?

Rank among 2012 models350th of 650(bottom half)

Rank among SEAT models200th of 310(bottom half)

vs average of all models-1%(82% avg)

vs 2012 models average+3%(78% avg)

vs SEAT average-4%(85% avg)

Mileage Analysis

70,829

Average miles

88,800

Expected for age

The average 2012 SEAT Mii had 70,829 miles on the clock at its 2024 MOT, which is below the expected 88,800 miles for a 12-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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Best Year to Buy?

Of the years with at least 100 tests, the 2019 model has the highest MOT pass rate at 93%, while the 2012 model has the lowest at 81%. Consider a different year if reliability is a priority. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

SEAT Mii by Year

Year	Pass Rate	Tests	Avg Mileage
2019	93%	1,976	27,272 mi
2018	89%	1,975	33,651 mi
2017	87%	2,338	39,917 mi
2016	86%	3,557	46,587 mi
2015	85%	4,201	52,581 mi
2014	84%	5,035	59,614 mi
2013	82%	5,782	66,168 mi
2012	81%	2,875	70,829 mi

Similar Cars to Consider

Ford Fiesta

2014 · 998cc Petrol

£1,750/year

79%

-2%

Vauxhall Corsa

2014 · 1398cc Petrol

£2,153/year

76%

-5%

Volkswagen Polo

2011 · 1198cc Petrol

£1,900/year

75%

-6%

Peugeot 208

2013 · 999cc Petrol

£1,750/year

75%

-6%

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About the 2012 SEAT Mii

The 2012 SEAT Mii is a city car. Our records list a 999cc petrol engine, though engines vary between versions. 2,875 MOT tests were recorded on this model in 2024, making it a reasonably common sight on UK roads. Among all models from 2012, the average MOT pass rate is 78%, and this model beats that benchmark.

With an average of 70,829 miles recorded at its 2024 MOT tests, SEAT Mii owners tend to use this car less than the typical driver.

2012 SEAT Mii Fuel Costs

The modest 999cc petrol engine keeps fuel costs low, which is a real advantage for a city car. Expect around 50 mpg in mixed driving, which works out to roughly £1,175 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).

What does it cost to own a 2012 SEAT Mii?

Total estimated annual running cost is £1,600 (£133/month), broken down as £1,175 fuel, £20 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 81% pass rate. Keeping on top of servicing will help avoid surprises.

SEAT Mii Reliability Trend

Newer SEAT Miis pass their MOT more often than older ones, by 6 percentage points on average, which is mostly down to age and wear.

Buying a Used 2012 SEAT Mii

At 14 years old, the SEAT Mii is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age.

Common Issues to Watch For

These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.

Coil Pack Failure

Medium risk

Smaller petrol engines are prone to ignition coil failures, causing misfires and rough running. Replacement is £50-£150 per coil.

Rust and Corrosion

Watch out

At 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.

Suspension Bushings

Watch out

Rubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.

Service History

Low risk

Always request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.

Running Costs Compared

How the 2012 SEAT Mii stacks up against similar cars for estimated annual running costs, insurance group, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Est. Ins. Group	Total/yr
SEAT Mii(2012)	81%	£1,175	£20	Grp 1-8	£1,600
Ford Fiesta(2014)	79%	£1,175	£20	Grp 1-8	£1,750+£150
Vauxhall Corsa(2014)	76%	£1,398	£200	Grp 8-20	£2,153+£553
Volkswagen Polo(2011)	75%	£1,175	£170	Grp 5-15	£1,900+£300
Peugeot 208(2013)	75%	£1,175	£20	Grp 1-8	£1,750+£150

Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.

Questions about the 2012 SEAT Mii

Is the 2012 SEAT Mii reliable?

Good reliability. Occasional issues but generally solid. 81% of MOT tests on 2012 SEAT Miis ended in a pass, from 2,875 tests (DVSA MOT data for tests in 2024, retests included). That's 1 point below the average of 82% across all models in the same data.

How much does a 2012 SEAT Mii cost to run?

Our estimate is £1,600 a year (£133 a month): £1,175 fuel, £20 road tax, £55 MOT and £350 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2012 SEAT Mii?

81% of 2,875 MOT tests on the 2012 SEAT Mii ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 350th of 650 models first registered in 2012 (bottom half).

Which year SEAT Mii has the best MOT pass rate?

Of the years with at least 100 tests, the 2019 SEAT Mii has the highest MOT pass rate at 93% and the 2012 the lowest at 81%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2012 SEAT Mii?

The average mileage recorded at MOT tests on the 2012 SEAT Mii is 70,829 miles, which is below the expected 88,800 miles for a 12-year-old car. This suggests lighter use than average, which generally means less wear on major components.