The average price of fuel I paid for during July 2015 was $1.22 – 1.50 per litre for 91 Octane unleaded add 10-11 cents for 95 Octane and at least 15 cents for 98 Octane. Diesel was priced around the $1.32 to $1.36 per litre the last time I looked.
Yes there was a large price jump for no reason depute the drop in oil prices to historic lows around the world. The value of the Australia dollar did not change very much hovering around the 70 cent to the USD mark as I recall.
Note that fuel prices vary according to area, level of competition and so forth.