American Express Co., which has been trying to boost use of its charge cards, has reintroduced a program that rewards charge card customers for grocery and gasoline purchases.

Through next March 15 Amex charge card customers enrolled in its Membership Rewards program will earn double the standard reward of one point for every dollar spent, up to $1,000 per month, on U.S. grocery and gas purchases. New customers approved for Amex's charge cards from April 1 through June 30 will automatically be enrolled in the double-points promotion. Corporate cards are excluded.

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