Performance by cohort
2 year bands · 1,283 tests
Pass rate is broadly flat across the cohorts — new and old ZX 1000 Wjf examples track each other at the test bay.
Pass
92.5%
Fail
2.6%
PRS
5.0%
Avg mileage at test
14,780 mi
Pass
92.9%
Fail
4.4%
PRS
2.4%
Avg mileage at test
12,379 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.