Performance by cohort
2 year bands · 1,571 tests
Pass rate is broadly flat across the cohorts — new and old Xc60 R Design B5 Mhev Auto examples track each other at the test bay.
Pass
93.4%
Fail
6.1%
PRS
0.5%
Avg mileage at test
33,142 mi
Pass
93.4%
Fail
4.6%
PRS
1.2%
Avg mileage at test
29,433 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.