Dollar Rent A Car and Thrifty Car Rental, subsidiaries of Dollar Thrifty Automotive Group, Inc., are giving customers who rent three or more consecutive days a free upgrade when paying with their American Express Card, PR Newswire reports.

Additionally, customers will receive a $25 American Express branded rewards card when renting a compact through full-size car at any participating Dollar or Thrifty Car Rental location in the U.S. The promotion is effective with 24-hour advance reservations made now through June 30, 2007.

To take advantage of the offer, use promotion code AX25 when making a reservation online at www.dollar.com or www.thrifty.com and print the special coupon to secure the free upgrade at the counter.

According to PR Newswire , the $25 American Express branded rewards card will be mailed to qualified renters six to eight weeks after the completed rental.