Funnily enough, they're running out of ethanol to put in the fuel
The mandate was pushed back because of this.
There's a 7/11 on Lane Cove Rd at North Ryde that I regularly fill up at - they have regular 91 unleaded and it's good quality, the fuel doesn't make the car run like crap or get poor economy. And when you do 1000-1200km per week you tend to notice what sort of mileage you're getting
I don't waste my money on 91 unleaded, the value for money is worse in my Commodore than using 95 unleaded, and in my work car (1.5L Hyundai Getz) I can't use it because it causes problems - as well as terrible economy and performance.