At the annual SEMA car show in Las Vegas this week, Gran Turismo 5 creative lead Kazunori Yamauchi was on-hand demoing his game for showgoers and talking to the press. Amidst a torrent of questions from Autoweek, Yamauchi roughly calculated the cost of creating Gran Turismo 5: a cool $60 million. That's what five years of development on a single game has cost Polyphony Digital thus far, an amount Yamauchi says was totally justified in order to "get it right." "We threw away the legacy code from GT4 and started from scratch ... It's been five years from [the release of] GT4, and that's the same amount of time it took to develop the first GT4." And rather than dodging the reasoning behind the lack of a solid GT5 release date anywhere outside of Japan, Yamauchi flatly offered, "That's more depending on SCEA marketing decisions." Allow us to venture a guess - first half of 2010, perhaps?[Via VGChartz]