Performance by cohort
3 year bands · 5,420 tests
Pass rate climbs 5.5 points across the cohorts — newer Roller Team examples clear the test more reliably than the early cars.
Pass
84.7%
Fail
8.6%
PRS
6.1%
Avg mileage at test
30,171 mi
Pass
88.3%
Fail
7.1%
PRS
4.3%
Avg mileage at test
19,199 mi
Pass
90.2%
Fail
5.0%
PRS
4.1%
Avg mileage at test
16,496 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.