Have raced the fog into PH on more than one occasion after departing from 700nm north with a CAVOK TTF.
Pass-a-frozo, fixed reserve is 30 minutes fuel at holding fuel flow, in most jets this would be equivalent to 1 go-round and an approach before you're on vapours. Most jets would be getting fuel lo level warnings long before you reach fixed res qty.
I would never plan into Perth ( at night ) without enough fuel for an approach, go-round, approach and 30 fixed, inspite of the fact that i have been flying A/C with autoland capability for a few years.
It did'nt take me too long to work out I was'nt going to get any medals for landing with minimum fuel and increasing the grey hair count.