汽车补贴返还系统（CARS），又称“旧车换现金”计划，旨在为美国居民提供经济激励，促使其在置换低燃油效率车辆时购买新的、更高燃油效率的车辆。该计划被宣传为通过提振汽车销量来刺激经济，同时使更安全、更清洁且燃油效率更高的车辆上路行驶。

The Car Allowance Rebate System (CARS), otherwise known as Cash for Clunkers, was a program intended to provide economic incentives to United States residents to purchase a new and more fuel efficient vehicle when trading in a less full efficient vehicle. The program was promoted as providing stimulus to the economy by boosting auto sales, while putting safer, cleaner and more fuel efficient vehicles on the road.