Save the offer to your Card and spend $40 or more, in one transaction, in-store only at BP by 14/7/16 to receive one $10 credit. Limited to first 40,000 Cards to register. Redeem offer up to 3 times at only American Express accepting BP locations.
AmEx Connect - https://network.americanexpress.com/connect/au/en/secure/doe…
Direct Enrolment - https://offerenroll.americanexpress.com/enroll/EnrollmentSit…
I did some quick calculations
Cheapest BP in Perth Today for (95 Premium ULP) $1.309
@ Ballajura
Cheapest Caltex Woolworths in Perth today for (95 Premium ULP) with fuel docket and 5.5% discount cashrewards egift cards >> $1.226 ($1.12077)
@ Greenwood, Mirrabooka, South lake, Warnbro Fair.
1.309-1.12077 = Losing $0.18823 per litre @ BP
$40(min spend)/1.309 = 30.56 L = $5.75 more expensive compared to Woolworths (So $4.25 saving with $10 credit)
Purchase more than 53L @ BP and you are losing money even with the $10 Credit
TLDR only spend the $40 minimum.