Things may have changed overnight, but yesterday Busselton had long queues (I heard an hours wait) Dunsborough was completely dry of fuel. Margaret River only has one servo with fuel and the dry one isn't expecting a delivery for days apparently. Places like Wandering and Collie were also low or out and some of Bunbury has been ordered to stop pumping fuel as the risk of an explosion/fire is too great with all the ash and embers around. Fuel will also be diverted to the fireground as the emergency vehicles need it to do their job, so that could become more of an issue with only the one road in and out open.
It's also eerie as hell with all the smoke and ash.