Performance by cohort
2 year bands · 1,510 tests
Pass rate climbs 10.1 points across the cohorts — newer ZS Excite T Gdi Auto examples clear the test more reliably than the early cars.
Pass
81.0%
Fail
17.9%
PRS
1.2%
Avg mileage at test
30,914 mi
Pass
91.1%
Fail
6.9%
PRS
1.8%
Avg mileage at test
25,171 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.