Found out recently that you can get 4 cents per litre off fuel for purchasing groceries worth over $25 at Dewsons and Supa Valu.
They offer 4 cents per litre off most mobil and selected BP. (Thats right BP!!! = Slightly cheaper 98RON)
Here's a link to a list of the locations:
http://www.quickstop.com.au/fuel_locations.html
or to the map:
http://www.quickstop.com.au/pdf/1072...FuelPoster.pdf