You may remember the Thrifty Car Rentals sweepstakes that ended May 31 — as a result of that promotion 92 weeks of free rentals were given away. The sweepstakes was such a success that another is being offered through Aug. 31. Visitors to the Thrifty Web site (http://www.thrifty.com) can sign up for a chance to win one of 92 free weeklong rentals in the United States. If you entered in the sweepstakes the last time it ran you will automatically be entered in the current version.