(FORTUNE Magazine) – At GM, it's stating to feel like a never-ending sale, from the 0% financing fixation to its Employee Discount clearance, scheduled to end in September. But just look at what happens to sales when the promos end. -- Margaretta Soehendro

2001: Keep America Rolling (1)

2002: ZERO ZERO ZERO (1)

2003: 24-hour test drive

2003: 72-hour sale (1)

2004: HOT BUTTON (2)

2004: Red Tag SALE

2005: HOT BUTTON (2)

2005: Employee Discount for EVERYONE

(1) 0%-financing-based deals

(2) Contests for free cars.