Performance by cohort
3 year bands · 166,247 tests
Pass rate climbs 4.7 points across the cohorts — newer Countryman examples clear the test more reliably than the early cars.
Pass
86.0%
Fail
9.9%
PRS
3.7%
Avg mileage at test
59,678 mi
Pass
90.7%
Fail
6.8%
PRS
2.2%
Avg mileage at test
34,712 mi
Pass
90.8%
Fail
6.2%
PRS
2.6%
Avg mileage at test
22,108 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.