If you have an American Express credit card, sign up for this promo, and if you spend $50 or more at participating gas stations or super markets, in a single transaction, you will get a $10 statement credit. Can be done up to 3 times during the promo period, which is from April 30 to May 30, 2015.
https://enroll.amexnetwork.com/CA/en...1&om_lid=amex8