HTZ) and Avis Budget ( CAR) asking them to submit their "best and final definitive proposals" on potential mergers by October. In a news release, Dollar Thrifty's CEO, Scott Thompson, said that continuing uncertainty over a transaction was in "no one's best interest." > > Bull or Bear? Vote in Our Poll "Hertz and Avis have made substantial progress with respect to regulatory reviews, and our Board has concluded that the time has come to determine if, and on what terms, a transaction can be achieved," Thompson added. Hertz and Avis have been locked in a drawn-out bidding war over Dollar Thrifty. Shares of Dollar Thrifty ended Friday down $2.46 at $61.91. Shares of Hertz ended the session down 48 cents at $9.71, and shares of Avis Budget finished the session down 12 cents at $11.61.