Sorry, should have said a week or two for the fuel to get through your car.
Agreed you can get dud fuel from anywhere, but luckily the local Shell and Mobil are always kept honest by the indepents, so there I normally wouldn't go near a Woolies.
What's the big petrol plant down in Melbourne in that has a petrol pump out the front? Ampol? Apparently the fuel out the front of the refinery is more expensive than the fuel from the plant which is transported up to Mt Isa... Go figure