If you have been waiting to trade in an old gas guzzler to take advantage of the federal "Cash for Clunkers" program, it's probably time to make a move. That is one of the main messages for consumers from Friday's confusion over whether the initiative had burned through its original $1 billion budget in just one week. Washington's Clunker Follies present consumers with both great opportunities to save money, and also many occasions to repeat the mantra "caveat emptor." Here are some questions about the program, and answers based on interviews with dealers, government officials and the rules of the incentive program.