Well, the earning rate varies depending on how long you use the card. At first you get 30c per gallon for the first 3 months, but finally you are left with the rate of 5c per gallon. 5 cents per gallon are earned on fuel purchases made at any participating CITGO branded retail location in the United States.
If you want more ability or are frustrated with the complex terms of the card, you may want to consider other cards with rewards. Specifically we would like to suggest getting the Discover it® Miles card. It earns 1.5x Miles per dollar on all purchases. and all rewards are doubled first year (provided you are a new cardmember). This card doesn’t make you pay any extra and you can spend earned rewards on travel or anything else.