Performance by cohort
2 year bands · 5,518 tests
Pass rate is broadly flat across the cohorts — new and old X3 M Competition Auto examples track each other at the test bay.
Pass
93.9%
Fail
3.5%
PRS
1.8%
Avg mileage at test
33,959 mi
Pass
93.9%
Fail
3.9%
PRS
1.9%
Avg mileage at test
24,816 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.