The average price of petrol I paid during October 2015 averaged $1.19 per litre for 91 Octane unleaded add 10-11 cents for 95 Octane and at least 15 cents for 98 Octane. The lowest was during the last week $1.14. Diesel was priced around the $1.21 per litre the last time I looked.
The price spiked to $1.36-1.39 range at the start of the Melbourne Cup weekend ‘public holiday’ but only Melbourne which is no surprise.
Note that fuel prices vary according to area and the level of competition and a whole heap of other factors like shopping discounts, public holidays and so forth.