43 million Gran Turismos served. 6 million GT4s.
http://ps2.ign.com/articles/608/608027p1.html
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Forty Million Gran Turismos
Sony reveals some startling numbers for the world's most popular racer.
by Anoop Gantayat
April 27, 2005 - Sony Computer Entertainment has announced worldwide sales totals for Gran Turismo 4, and the numbers are sure to please the investors. Since its Japanese release last year and continuing on through the American and European releases, GT4 has sold a worldwide total of 6.25 million copies. This breaks down to 1.09 million in Japan, 1.94 million in America and 3.12 million in Europe.
Worldwide, the series has sold a total of 43,670,000 copies including Gran Turismo, Gran Turismo 2, Gran Turismo 3 A-Spec, the Gran Turismo Concept series, Gran Turismo 4 Prologue and Gran Turismo 4. This total is current as of the end of March and covers seven years and four months time.
That is almost half of what the entire Mario franchise has done in it's history.
It's twice as much as any of Capcom's franchises have sold, and they've made like four hundred Mega Mans.
Gran Turismo rox.