Performance by cohort
2 year bands · 6,370 tests
Pass rate climbs 2.4 points across the cohorts — newer 2008 GT Line Puretech S/s examples clear the test more reliably than the early cars.
Pass
88.3%
Fail
7.9%
PRS
3.4%
Avg mileage at test
29,445 mi
Pass
90.7%
Fail
7.2%
PRS
2.1%
Avg mileage at test
23,668 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.