From the
National Car Rental Internet web site:
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">FREE DAYS FROM NATIONAL!
Rent from National in the U.S. or Canada between September 1 and December 18, 2003, and earn a free rental day certificate for every two qualifying rentals. To qualify, each rental must be for an intermediate or larger vehicle for a period of two or more days. The free day certificates you earn will be sent to you beginning in November and can be used on any rental from January 2 through June 20, 2004. There's no limit to the number of free days you can earn during this promotion.
PLUS A FREE WEEKEND DAY
Receive one free weekend day on a weekend rental through December 18, 2003 (minimum two weekend days required.) Use Coupon ID Number 10008904 when you make your weekend reservation to be sure this rental will also count toward your free rental day certificates.</font>
Moreover, if you enter or confirm your valid e-mail address, you will receive one rental credit towards your first free day, which means that you are only one rental from a free day.
Enjoy!