CHICAGO (CBS) — A Chicago woman is suing Hyundai over inflated fuel economy claims.

Hyundai admits a flaw at its testing facility in Korea led to an exaggerated fuel economy rating on over 600,000 vehicles.

A Chicago owner of one of those vehicles says in a lawsuit that she thought she would be getting 20 miles per gallon on her Hyundai 2013 Santa Fe Sport, but only gets 16.

She claims that costs her about $700 a year.

Hyundai says its voluntary reimbursement program is the quickest remedy for car owners.

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