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You will be able to earn 6 cents per gallon using the Exxon Smart card if you purchase at least 45 gallons (maximum is 100 gallons) of Exxon or Mobil branded fuel in a billing cycle. To apply for this card you should visit the ExxonMobil website. Or you can apply for another gas credit card with which you will be able to earn cash back or bonus points on all your purchases, including gas. Compare credit cards and make some calculations to see which card brings more rewards to you.