6c a litre off fuel at Coles Express
First you need to spend $30 or more at Coles, BI-LO or Liquorland - all in one transaction. You get a 4c off fuel voucher on the docket. Then spend 2 bucks at a Coles Express shop and they give you another 2c off. Total 6c off a litre. Not bad!
But remember to justify the 2 bucks you need to be getting a 100 litres or more of fuel - so I would not recommend buying something extra JUST to get the 2c more. Buy something there that you were going to buy anyway and then it is good value.