While I am 100% sure it wasn't the desision of director Jon Favreau, but rather because Audi paid a few $$$$$$$$$ get their name in the new movie... http://www.oncars.in/Car-News-Detail/Iron-Man-drives-the-all-electric-Au...
Never the less, it's still great news for Tesla and EV's. As it is, Favreau has stated that Elon Musk is in his openion the REAL Tony Stark, and I also do believe Favreau owns a Model S himself. Plus, the Model S P85 is actuallly faster than the Audi R8 e-tron, which goes from 0-60 in only 4.8 secs (compaired to the P85's 4.0 / 3.9 sec runs). Also, the Audi only gets 155 miles per charge (far less than 265 in a MS P85).
Either way, in less than a week, GM, MB, and now Audi have all had major auto news with regard to announcing new EV's. Which valadates Tesla's business model is well on its way to world domination!
The ICE is dead, long live the EV!