According to FuelCheck, it appears that some Metro petrol stations across Sydney (not all of them) have dropped their E10 Unleaded fuel prices to 99.9c/L.
With Unleaded sitting at around $1.30/L at the same servos, it seems a compelling reason to use it (even if there is a slight fuel economy drop).
Filled up at Fairfield today Hamilton road and it wasn't 99c. It was 126c.