NEW YORK -- The American Express corporate card program's small-business customers will get 3% discounts on Mobil gasoline purchases beginning Jan. 1.

The agreement between Mobil Oil Corp. and American Express Small Business Services applies at participating Mobil stations nationwide, with the exception of New Jersey, which prohibits discounts on gasoline.

The discount will appear automatically as a credit on card-members' monthly statements. There is no cap on spending. The offer is not valid on diesel fuel.

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