During it's 5 years in development, Gran Turismo 5 has racked up quite a tab. It's total cost in development so far? $60 Million, according to Gamasutra.
"Speaking in an Autoweek interview conducted during the SEMA auto show in Las Vegas this week, the Gran Turismo creator seemed to downplay the expense, taking into account Gran Turismo 5's scope: "There are other games that cost more," he said. "Considering the size and scale of the game, I think it's probably a fairly small amount."

Large or small, car companies may not be significantly helping out with that sum. Yamauchi says the studio hasn't accepted deals aimed at getting specific models into the game, although Polyphony and manufacturers have developed some "relationships where we collaborate to raise the level of the game."
Let's hope that this $60 Million has made Gran Turismo 5 all the more enjoyable.