I use Shell gasoline exclusively and pay using the Shell Citibank mastercard. Using the card provides a 5% rebate on any Shell gasoline purchase. The rebate at $3.00 per gallon amounts to 15 cents which effectively means you are paying $2.85 per gallon. That is a great deal in my book as I don't find any stations around selling gas for 15 cents a gallon less than Shell here locally.