I work at Bp shepparton here in VIC and our BP ultimate is far better than those that are in the city, the reason you get bad fuel is that if you live in urban areas , the simple answer is more people use fuel and with a 5000 litre fuel tank the last 1000 is basically dregs take my advice fill up in the early hours of the morning when they've just filled the tanks or fill up in stations not used as much, those out of the way bastard truck stops