Amex Offer:Get a one-time $10 statement credit by using your enrolled Card to make a single purchase of $30 or more when you pay at the pump at any Exxon- or Mobil-branded locations by 12/31/2015.
I had it on 1 of my 2 cards, now how to get my car to take $30 worth of fuel.....
Excludes gift cards and convenience store.

TermsValid only for at the pump transactions at any Exxon- or Mobil-branded locations using your enrolled Card or a Speedpass(TM) linked to your enrolled Card. Not valid for online, in-store or Speedpass+ mobile app purchases. Excludes convenience store purchases, car washes, aviation fuel, car repair, garage service and gift card purchases. Valid at any participating location in the US. If you have received a replacement card prior to the offer, and you have enrolled this replacement card for the offer, you must update the card on file with your Speedpass account with the new replacement card information in order to receive the statement credit. (The Speedpass key tag is a quick and easy contactless payment system. To learn more, go to speedpass.com). Enrollment limited. Offer is non-transferable. Must add offer to Card and use same Card to redeem. Only US-issued American Express Cards are eligible for this offer. Limit 1 statement credit per American Express online account. Statement credit will appear on your billing statement within 90 days after 12/31/2015, provided that American Express receives information from the merchant about your qualifying purchase. Note that American Express may not receive information about your qualifying purchase from merchant until all items from your qualifying purchase have been provided/shipped by merchant. Statement credit may be reversed if qualifying purchase is returned/cancelled. If American Express does not receive information that identifies your transaction as qualifying for the offer, you will not receive the statement credit. For example, your transaction will not qualify if it is not made directly with the merchant. In addition, in most cases, you will not receive the statement credit if your transaction is made with an electronic wallet or through a third party or if the merchant uses a mobile or wireless card reader to process it. By adding an offer to a Card, you agree that American Express may send you communications about the offer. POID: BY4H:0001