Could Gran Turismo PSP be the highest selling PSP game?

[FilaBrasileiro]

Gilgamesh said:

FilaBrasileiro said:
It won't be on vgc, most people including me will download it, so....

Well thats alright because Polyphone Digital usually shows how much there games sell. VG Chartz has GT5P at 3.05 million and that's all physical sales, but Polyphone Digital has GT5P at 3.6 million, and that includes downloads aswell.

How do you know that includes downloads? You don't as they don't specify, you're just assuming.