Performance by cohort
2 year bands · 4,075 tests
Pass rate climbs 1.3 points across the cohorts — newer C3 Flair + Puretech S/s examples clear the test more reliably than the early cars.
Pass
90.9%
Fail
6.5%
PRS
2.2%
Avg mileage at test
29,170 mi
Pass
92.1%
Fail
4.1%
PRS
3.0%
Avg mileage at test
25,686 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.