Gran Turismo has sold over 75 million copies

[bananaking21]

Boutros said:
So like 5 million games sold in the psat two years (including all GT6 sales).

so its afe to assume that GT6 did around 4~ million. probably 4.5 - 4.7 though. PSP is dead, and the only other game left that could possibly sell is GT5.