Performance by cohort
3 year bands · 1,708 tests
Pass rate climbs 9.6 points across the cohorts — newer Auto Sleepers examples clear the test more reliably than the early cars.
Pass
86.3%
Fail
10.7%
PRS
2.7%
Avg mileage at test
27,722 mi
Pass
90.4%
Fail
4.5%
PRS
4.5%
Avg mileage at test
14,628 mi
Pass
95.9%
Fail
1.6%
PRS
1.2%
Avg mileage at test
9,372 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.