Mostert finished third in the opening two sprints.
โOne day, youโre right smack bang in the middle and youโre happy as, and one day youโre just a little bit out of it,โ he said.
โNot really sure what to think about that.โ
Local product Brodie Kosteckiโs hopes for a home race victory were dashed when a poor qualifying effort condemned him to 15th.
Kostecki finished the two opening sprints in Perth in fifth and seventh.
The final sprint in Perth starts at 3.15pm (WST).
Race 16 qualifying results:
1. Broc Feeney (Triple Eight Race Engineering)
2. Cam Waters (Tickford Racing)
3. Will Brown (Triple Eight)
4. Matt Payne (Grove Racing)
5. David Reynolds (Team 18)
6. James Golding (PremiAir Nulon Racing)
7. Ryan Wood (Walkinshaw Andretti United)
8. Cam Hill (Matt Stone Racing)
9. Bryce Fullwood (Brad Jones Racing)
10. Anton De Pasquale (Team 18)
AAP
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