I don't have a link because you have to click an enter now button in the statement email that woolworths send out, so check your email
The Terms and Conditions:
# Everyday Rewards "Win $500 in Fuel" promotion commences on 13/06/2012 and closes at 23:59 AEST on 24/06/2012 ("Promotional Period"). To enter the Promotion, a Registered Everyday Rewards Customer needs to click on "Enter Now" button in the "win $500 in Fuel" competition in their Everyday Rewards June Quarterly statement email, confirm their Everyday Rewards card number and click the "enter now" button during the Promotional Period. A maximum of one entry will be recorded for each registered Everyday Rewards member during the Promotional Period. The first 20 valid entries randomly drawn will be the winners. Each prize will consist of 1 x $500 Caltex Woolworths Petrol Gift Card. The Total Prize pool value is $10,000. Prizes are not transferable or exchangeable and cannot be redeemed for cash. Prize draws will take place at 11:00am AEST on 27/06/12 at Salmat IDR, Level 2, 116 Miller Street North Sydney, NSW 2060. Winners will be notified by email within 2 days of the draw, and in writing within 21 days of the draw and will have their first initial, surname and state published on the Everyday Rewards website
www.everydayrewards.com.au and in The Australian Newspaper on Wednesday 4 July 2012.