ABC has some good tips on how to save when renting cars. For instance:

• Book online, it's often cheaper.
• When you walk in, ask about rates without mentioning your reservation. You may get a better deal right there.
• Many credit cards will cover you in the event of a rental car crash. If so, pay with it , decline the rental car insurance, and save.
• Renting for 4-5 days? Ask about the weekly rate. It may be less expensive.

What tactics do you use to keep car rental places from driving off with your wallet?Car Rentals: Don't Get Taken for a Ride [ABC]
(Photo: Mr Marmot)