Performance by cohort
2 year bands · 2,195 tests
Pass rate is broadly flat across the cohorts — new and old 2008 GT Line Puretech S/s Auto examples track each other at the test bay.
Pass
89.8%
Fail
5.8%
PRS
4.2%
Avg mileage at test
26,505 mi
Pass
89.0%
Fail
8.0%
PRS
3.1%
Avg mileage at test
23,449 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.