Hertz has good offer where you can get 6x AAdvantage miles/ $1 on your rentals through August 31st, 2015 when you rent for 5+ days. You will get 4x miles when you rent for less than 5 days.
Up To 6x AAdvantage Miles With Hertz Rentals
*Your discount CDP# 217692, PC# 179255, and your AAdvantage number is required at reservation.
When you book with Hertz use your discount CDP# 217692, PC# 179255, and your AAdvantage number is required at reservation to get up to 6x AAdvantage miles on your rental through the end of August.