Sony’s Gran Turismo franchise hit 55.45 million unit sales in December 2009, according to developer Polyphony Digital.
The PlayStation series debuted in Japan in December 2007, and the following year in Europe and North America.
2001's Gran Turismo 3 A-Spec (pictured) is the bestselling title in the series, having sold 14.89 million copies.
Lifetime franchise sales data also shows that the most recent release, Gran Turismo PSP, has reached 1.8 million sales.
Gran Turismo 5 was scheduled to launch for PS3 this March but was recently delayed to an unspecified date, with publisher Sony citing production-related matters.