Performance by cohort
2 year bands · 15,180 tests
Pass rate climbs 6.9 points across the cohorts — newer I800 examples clear the test more reliably than the early cars.
Pass
68.3%
Fail
22.8%
PRS
8.2%
Avg mileage at test
98,968 mi
Pass
75.2%
Fail
14.6%
PRS
9.4%
Avg mileage at test
53,728 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.