Performance by cohort
2 year bands · 6,340 tests
Pass rate climbs 2.9 points across the cohorts — newer 2008 Allure Premium Ptech S/s examples clear the test more reliably than the early cars.
Pass
85.7%
Fail
9.3%
PRS
4.7%
Avg mileage at test
29,275 mi
Pass
88.6%
Fail
7.6%
PRS
3.1%
Avg mileage at test
27,281 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.