Gran Turismo 5, the first 20 million selling GT... maybe.

[Scoobes]

S.T.A.G.E. said:
GT5 is going to sell 8 million tops.

As ridiculous as the original post is I would say 8 million is a minimum, not a maximum. Consider that GT5: Prologue can sell 4 million, do you really think a main GT game will only double its sales?