right lets stuff you all up.
The BP refinery in Kwinana is the only one in WA. Due ot WA's boutique fuel laws its the only one allowed to produce fuel for WA. All fuel in WA is suppose to come from that refinery. The other companies buy it and add there own little odds and ends to make there premium unleaded and vortex etc.
Shipping fuel from the eastern states would cost more and the fuel would not meet our boutique fuel laws so couldn't be used unless it is refined to match the fuel produced at BP's kwinana refinery.