There is actually a way that I just discovered to get a second bid on rental cars. I was picking up a car at 10:00 AM (in the morning) on a Friday and dropping it off at 10:00 PM in the evening. This means that I would have the car for 6 days and 12 hours, but from the perspective of the rental car companies that it is 7 days. In order to make a second bid WITHOUT changing the car type, you must change at least one of your dates. You can make use of this fact WITHOUT changing your plans. In order to get the second bid, I changed the return date to Friday at 12:05 AM, which means that I am saying that I am returning the car 2 hours and 5 minutes later. So now I am saying that I will have the rental cars for 6 days and 14 hours and 5 minutes, which from the perspective of the rental car comanies is still 7 days. This is win-win. I get to make a second bid and I am sure the rental car company won't be upset when I return the car 2 hours and 5 minutes early. :) By extension, one would assume that you could do the reverse of this trick as well. For example: ***** Let's say you want to have the car for close to the full 7 days. You pick up the car at 9:00 AM on Friday. On your first bid attempt, you say that you will return the car the following Friday at 8:00 AM. (this is 6 days and 23 hours, which is 7 rental car days). If your bid fails, you can make a second bid attempt by changing the return date to Thursday night at 11:30 pm (this is 6 days, 14 hours, and 30 minutes, which is still 7 rental car days). The return date is always when you say you EXPECT to return it, as long as you return it prior to Friday at 9:00 AM, they will not charge you extra. Of course in this case, the rental car is expecting the car earlier and theoretically are expecting to rent the car out at that time. As a courtesy, you can warn the rental car that you will be returing the car later than expected, but before you feel guilty you should realize that the ultimate point is that you did pay for the full 7 days. ***** I hope this tip is helpful.