Performance by cohort
2 year bands · 6,192 tests
Pass rate is broadly flat across the cohorts — new and old X5 Xdrive30d M Sport Mhev Auto examples track each other at the test bay.
Pass
91.9%
Fail
6.6%
PRS
1.0%
Avg mileage at test
39,933 mi
Pass
91.3%
Fail
7.1%
PRS
1.2%
Avg mileage at test
31,280 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.