National Emerald Club is once again running a One Two Free promotion where members can earn one free rental day for every two qualifying rentals made by Jan. 31, 2013. Qualifying rentals include midsize or larger vehicles rented at participating National Car Rental locations in the U.S. for a minimum of two consecutive days. Free days can be used anytime through June 15, 2013 for a rental of a compact through fullsize car. Members can redeem up to three free rental days at a time. The offer is exclusive to Emerald Club members and registration is required at http://www.emeraldclubpromos.com/12Free/2012