Every year National Car Rental runs the most lucrative rental promotion, and they’ve brought it back for 2017. Too bad I rent cars far less frequently than I used to, because I’ve earned and used several free rental days with this offer in the past and of course the free rentals are on top of usual rewards earning.
The way it is that you get a free rental day for each time you earn 600 points in the promotion. And each rental of 2 days or more earns 300 points.