Those are good references - you can also try https://www.energy.gov.au/publications/australian-petroleum-statistics-2019. see Table 3A for total sales of Automotive Gasoline in FY2018-19 = 17.57GL and Table 8A for quarterly average retail fuel prices, 142cpl for 91RON and 154 for 95RON as the simple average of the four quarters in the corresponding period. Table 3A splits out premium vs non-premium fuel if you want to disaggregate. Interesting to note that petroleum sales have been in decline for pretty much all of the decade.
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