Perth.
Having operated there many times years ago, in the good 'ole B707, we always (without exception) had diversion fuel to Learmouth plus one additional hour.
No exceptions.
And, yes, I diverted twice, due to fog at PER.
Extra fuel in your back pocket (so to speak) is part and parcel of the six P's.
Prior
Planning
Prevents
Pi**
Poor
Performance
Having only absolute minimum fuel overhead PER is many times just asking for trouble.
The company I worked for knew this.
I knew this...so it didn't happen.
End of story.
Additionally, planning a flight, any flight, on statistical averages of the weather, is folly in the extreme.
