Performance by cohort
2 year bands · 2,849 tests
Pass rate climbs 3.1 points across the cohorts — newer Puma ST Line Vignale Mhev examples clear the test more reliably than the early cars.
Pass
90.4%
Fail
7.1%
PRS
2.5%
Avg mileage at test
30,439 mi
Pass
93.5%
Fail
4.7%
PRS
1.4%
Avg mileage at test
23,601 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.