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There's also a 10 cpl discount offer if you spend $20 at Coles Express, as posted on Oz Bargain:
https://www.ozbargain.com.au/node/132721
From memory, Coles Express now has many items at similar prices to Coles supermarkets, so could work well.
This offer is illegal according to the ACCC.
Consumer watchdog ACCC takes Woolworths, Coles to court over fuel dockets